Explanation Of Contact Tracing; Pentagon`s Decision To Release UFO Footage; How An Exosuit Could Help Humans Explore The Ocean Depths

CARL AZUZ, CNN 10 ANCHOR: Contact tracing is the subject of today`s first report on CNN 10. Of course we`ll be explaining what that`s all about. I`m

Carl Azuz away from the CNN Center but happy to be anchoring your news this Wednesday. The United States passed a milestone yesterday in the number of

its coronavirus cases.

According to Johns Hopkins University, more than 1 million cases of the disease have been confirmed in America. That`s about a third of the cases

confirmed worldwide and when we produced this show about 58,000 Americans have died from COVID-19. For perspective, the flu infects roughly 26

million Americans on average each year and it kills an average of 36,000 people.

So based on those numbers, the flu infects many more people than coronavirus has but COVID-19 is more dangerous. Some U.S. states are grappling

grapple [ˋgræp!] v. 努力解决（问题等）

with decisions on when to allow their businesses to reopen and some have already started doing that. Antibody testing factors in here.

This can be done through blood samples and it can detect if people have had coronavirus even if they don`t know it.

It`s possible that those who`ve had the disease and then recovered from it can be protected from getting infected again by the antibodies they

develop, but health officials say there`s no proof that will happen. They don`t know how long it will last if it does and there are concerns about

the dependability of the antibody tests themselves. But they`re a step toward knowing who`s had COVID-19 and possibly preventing the future spread

dependability [dɪ͵pɛndəˋbɪlətɪ] n. 可信任；可靠性

of it and contact tracing can help with that too.

(BEGIN VIDEO CLIP)

UNIDENTIFIED MALE: Contact tracing is part detective work, part widely used public health method and experts believe a key strategy in fighting the

coronavirus pandemic. It relies on identifying and interviewing every person who tests positive, isolating them and then finding anyone else that

person could have infected. These people may then be quarantined before they can spread the infection to others. A recent study estimates that

because one person infected with COVID-19 can infect two to three other people just one positive case can turn into more than 59,000 cases after 10

rounds of infection.

Contact tracing can help prevent this potential wave of infections from becoming a tsunami. It`s a tedious approach but one that is widely-credited

tedious [ˋtidɪəs] adj. 冗长乏味的；使人厌烦的

widely-credited 广受赞誉的

with stopping SARS in 2004. After that outbreak infected more than 8,000 people all around the world and killed nearly 800. Public health officials

say contact tracing is a necessary step before certain businesses can reopen and people can start to return to normal activities.

Some countries including South Korea, India and Singapore are using smartphone technology alongside traditional techniques to ramp up their

ramp up 加强；增强

contact tracing programs. While the CDC in the U.S. has started a pilot program to ramp up contact tracing in some states, many studies estimate

pilot program 试验方案

that the U.S. will need hundreds of thousands of additional public health workers before a contact tracing system can really begin nationwide.

(END VIDEO CLIP)

AZUZ: 10 Second Trivia. Which of these stories made headlines in 1947? Flying Saucers Seen in Washington, Communism Declared in China, Barbie Doll

Makes Debut, or First Corvette Introduced. A civilian pilot named Kenneth Arnold said he saw flying objects that a reporter mistakenly called flying

saucers.

For decades, the U.S. military has been studying aerial encounters with unknown objects aka UFOs. This week the Pentagon released three videos that

were recorded during U.S. Navy training flights and they apparently show mysterious airborne objects captured by the planes infrared cameras.

One of the recordings was made in 2004. A pilot who saw that object said it moved rapidly in ways he couldn`t explain. The other two clips were

captured in 2015 and in one of those a pilot can be heard saying the object is a drone. So was it? The Pentagon says whatever was recorded remains

unidentified and it didn`t give any hints as to what it thinks the objects might have been.

hint [hɪnt] n. 建议，指点; 暗示

The reason the military officially released the videos yesterday after they had been published without permission by other organizations, was to help

clear up public debate over whether the videos were real and if there`s any more to them. The military also wants to encourage pilots to report

anything strange they see because any unauthorized object in the sky can be dangerous to aviators and U.S. military operations.

So humans have crisscrossed the skies. They`ve made several trips to the moon and mapped it as we showed you earlier this week. People have also

crisscross [ˋkrɪs͵krɔs] v. 在…交叉往返; 纵横交错于

mapped Mars and sent spacecraft to the far reaches of our solar system. So why is it that more than 80 percent of our oceans are still unmapped and

unexplored according to the National Ocean Service. Like space exploration, deep water exploration is expensive. It can be dangerous. It`s time

consuming and researchers have trouble getting funding but there are some inventors who are finding new ways to go deep.

(BEGIN VIDEO CLIP)

PHIL NEWTON, DESIGNER OF EXOSUIT: The latest suit that we`re building right now is called an Exosuit. An Exosuit is very simply is from exoskeleton,

Exosuit 动力服

exoskeleton [͵ɛksoˋskɛlətn] n.【动】外骨骼

like a crab shell and all your soft meat inside it doing what you want to do. So it`s kind of like "Ironman" come to life.

My name is Phil Newton and I design and build things to go under the sea, deep under the sea. The whole idea of being able to get people down into

deep water and that huge part of the planet that we`re denied access to by birth (ph) is a very exciting one. We build a lot of devices that haven`t

been built before and that`s what makes the whole thing fun. We put this in a hydraulic press.

In 1985, we built the first of what were called "newt suits" named after my last name Newton and the aquatic salamander. So we learned everything

salamander [ˋsælə͵mændɚ] n. 蝾螈

that`s wrong with them and over a period of time came up with a brand new - - completely updated version called the Exosuit. An atmosphere diving suit, it`s nothing more than just a big camera case. Inside the suit

atmosphere [ˋætməs͵fɪr] n. (標準）氣壓

you have the same pressure that we were designed to be at, the pressure that we`re at right now. And with this suit, you can go down to 1,000 feet

and even deeper and have no pressure effects whatsoever because inside it is one atmosphere.

UNIDENTIFIED MALE: Well we`re going to go for vacuum.

UNIDENTIFIED MALE: Submarines work beautifully submersible, the deep workers (ph). The subs are terrific for survey work so they can zip in

submersible [səbˋmɝsəb!] adj. 能沉入水中的；能潜航的

zip [zɪp] v. 有力而迅速地行动（或移动）

around shipwrecks, wellheads, all that sort of stuff. The suits are better suited for working. Your arm`s actually in there. Your hands are gripping

the grippers and so when you move, it moves. It`s really kind of a paradox in as much as it has to be absolutely rigid to withstand that high outside

gripper [ˋgrɪpɚ] n. 夹子

paradox [ˋpærə͵dɑks] n. 自相矛盾的人或事

pressure at say 1,000 feet, the pressure is 500 pounds per square inch. But it has to be flexible so you can move the arms and legs and work otherwise

what`s the point in going down there.

The suit has a tether to the surface and that tether provides you with power because the suit flies. It has thrusters on it and it flies around on

tether [ˋtɛðɚ] n.（牛、马等的）拴绳，系链

thruster [ˋθrʌstɚ] n. 火箭推进器；矫正（控制）舱身用火箭

the end of this umbilical. There`s optic fiber inside of the umbilical so we can take back video. The oxygen supply system does not come from the

umbilical [ʌmˋbɪlɪk!] adj. 脐带的

surface. The oxygen supply is built into the suit and the supply is about two full days. So why doesn`t everybody do it? Well first of all, the suits

are very hard to build and they`re expensive. They`re very expensive so the most difficult thing is getting the price down. Going down in the exosuit

is almost always going down for a purpose.

I want the pilot to be able to accomplish the task, whatever it is, whether photography, welding, cutting, blasting, burning and not think about the

suit at all. You shouldn`t even know it`s there. It has to be unremarkable. The more unremarkable the better. I guess what drives me is there`s still

so much more to be done. It`s tremendous to go to greater depths than you`ve been to ever before and to examine them. And when archeologists and

scientists are able to go down there, the deeper they go the more things they find that they didn`t even know existed.

(END VIDEO CLIP)

AZUZ: NASCAR racer Denny Hamlin recently finished last at Talladega. OK. It wasn`t a real race. NASCAR has postponed its events because of coronavirus

but the online game Hamlin was in came to an abrupt end, for him anyway, when his daughter accidentally disconnected him from the server.

DENNY HAMLIN, NASCAR RACER: Hey my screen just went black.

AZUZ: Uh oh is right. Daddy Hamlin wasn`t too happy when the seven year old forced him into last place. Maybe for punishment she could just take a lap

but she might be happy that his "Talladay" got away. It wasn`t all fun and games. Maybe he seemed too socially distant and even if she had to "peel"

out after making his game crash and burn. It`s still supposed to be fun when your family comes to the race.

We`ve got some viewers from across the Pacific today. Funabashi High School is in Chiba, Japan. You guys get a perfect CNN 10 out of 10. I`m Carl Azuz.

END