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CNN NEWS:科学家欲对蚊子实施基因生物战

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2016-03-14 15:57

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  [00:10.47]Could mutant mosquitoes stop the dangerous Zika virus?

  [00:15.40]Hi. I'm Carl Azuz, and that's what's first up on our show today.

  [00:18.53]Zika, as we've told you, can dramatically harm the unborn babies of pregnant women.

  [00:24.71]But mosquitoes also carry malaria, yellow fewer, West Nile virus.

  [00:27.31]The insects are responsible for more human deaths than any other animal on the planet.

  [00:35.43]And so far, people have been unsuccessful in exterminating them long term.

  [00:37.04]Now, scientists are considering waging biological and genetic warfare against mosquitoes.

  [00:43.17]One option would infect them with bacteria that would stop the growth of viruses,

  [00:47.69] like Zika, inside mosquitoes.

  [00:49.44]Another would use gamma radiation to sterilize male mosquitoes to keep them reproducing with females.

  [00:55.78]A third possibility: genetically modified male mosquitoes to pass a deadly gene to wild female mosquitoes.

  [01:03.15]Critics say all of these ideas have major problems.

  [01:06.18]They're not proven to work.

  [01:08.42]There are concerns about how they'd impact the environment, or the people living in it.

  [01:12.47]An environmentalist with Emory University says it's possible these methods could become useful tools,

  [01:18.62] though not a silver bullet in fighting off man's deadliest enemy.

  [01:22.68]Call them stargazers, sun seekers, see the moonlights in their eyes.

  [01:27.28]Thousands of people in the Pacific island

  [01:28.95]nation of Indonesia looked up Wednesday morning to view a total solar eclipse.

  [01:33.61]This is when the moon moves directly between the earth and the sun.

  [01:36.80]The best view was on the Indonesian island of Sumatra,

  [01:39.67]but the event was partially visible from Hawaii to Malaysia to Australia.

  [01:43.95]The next total solar eclipse is expected on August 21st of next year,

  [01:49.37]and would be visible in a narrow part of the U.S.

  [01:51.56]REPORTER: Watching as the moon blocks out the light from the sun,

  [01:59.99] it can be hard to imagine the amazing cosmic coincidence taking place.

  [02:05.01]The sun's diameter is some 400 times larger than the moon's,

  [02:08.49]but it's just the right distance away to appear the same size.

  [02:12.30]For a couple of minutes when the sun and moon are perfectly aligned,

  [02:18.28]the moon completely covers the sun's disc.

  [02:20.96]The sun's atmosphere or corona can be seen in the dim light, along with stars and planets.

  [02:27.60]This so-called totality only exists in a narrow band, where the moon's shadow falls on the Earth.

  [02:34.42]Outside this zone, some observers can see a partial eclipse,

  [02:38.85]where it looks like a chunk has been taken out of the sun.

  [02:41.82]It's not a phenomenon that will last forever.

  [02:45.04]The moon is slowly moving away from the Earth and one day,

  [02:48.98]it will appear too small in the sky to cover the sun completely.

  [02:52.19]If you are lucky enough to see this incredible spectacle, remember,

  [02:56.71]never look directly at the sun, even with everyday sunglasses.

  [03:01.12]You risk causing permanent damage to your eyes.

  [03:04.70](END VIDEO TAPE)

  [03:05.27]AZUZ: You know why yesterday's transcript page was awesome,

  [03:12.58]because it's where we found these three schools for our "Roll Call".

  [03:16.15]We're starting in Quezon City.

  [03:18.07]It's in the island nation of the Philippines,

  [03:20.34]and it's where Far Eastern University is watching.

  [03:22.86]Next, to Platinum, Alaska, the miners are here today.

  [03:26.22]Hello to everyone at Arviq School.

  [03:28.36]And our third mention goes to Christian County High School.

  [03:31.96]It's in Hopkinsville, Kentucky.

  [03:33.43]We're saluting the Colonels.

  [03:35.04]Several parishes in the U.S. state of Louisiana are under a flash flood emergency.

  [03:39.99]As of yesterday, they've gotten between eight

  [03:42.19] and fourteen inches of rain in a short amount of time,

  [03:45.42]with another three to five inches possible by this morning.

  [03:48.70]Dozens of homes were evacuated.

  [03:50.42]Part of Interstate 20 was shut down.

  [03:53.40]It's because of a slow-moving storm system that's soaking areas in nine states,

  [03:57.74]from Texas to Illinois.

  [03:59.02]When severe weather strikes, the leading cause of death isn't tornadoes or hurricanes.

  [04:04.53]It's flooding.

  [04:05.23]And drivers are in serious danger.

  [04:06.79](BEGIN VIDEOTAPE)

  [04:07.80]JENNIFER GRAY, AMS METEOROLOGIST: Anytime we have major flooding events,

  [04:11.11]very heavy rainfall, unfortunately, the images are all too common of cars being swept right off the road,

  [04:16.69]many times, the drivers still inside and water rescues taking place.

  [04:21.88]It only takes a little bit of water to carry your car off the road.

  [04:29.57]In fact, six inches of water will sweep you, me off of our feet.

  [04:33.54]One foot of water will float your car

  [04:36.23]and it only takes two feet of water to completely wash your car away.

  [04:41.31]That's why we say it's so important to turn around, don't drown.

  [04:45.51]You don't know how much water is there.

  [04:47.93]Do not drive through it, as it could be deadly.

  [04:50.60](END VIDEOTAPE)

  [04:51.15]AZUZ: On the eastern coast of mainland Japan,

  [04:52.85]there are ghost towns, contaminated by radiation.

  [04:56.13]Some of the houses clearly show the damage

  [04:58.54] of the earthquake that struck five years ago, on March 11th.

  [05:01.89]Some where entirely swept away by the tsunami,

  [05:05.22] the wall of water that washed in from the Pacific afterward.

  [05:08.61]Tomorrow, on the actual anniversary,

  [05:10.93]we're taking you inside one of these abandoned towns.

  [05:14.42]Today, an overview from a drone.

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