CNN 美国有线新闻 2014-10-12

 More is known about the surface of the moon and the Mars than the bottom of the Earth's ocean. That's adding to the challenge of finding a missing passenger plane. 

 
First up, this Wednesday on CNN Student News, the search for Malaysia airlines Flight 370. It's entering a new phase. The jet and its 239 passengers and crew member disappeared in early March. Officials believed it crashed in the southern Indian Ocean. The primary search area is about the size of west Virginia. No trace of the jet has been found. Part of the reason, we know so little about the ocean flow. Just 5% of it has been mapped and one experts said we've only seen 1%. Why? For one thing, pressure. Engineers have trouble constructing machines that can stand the weight of the water above them; but new data can help explore the ocean floor.    
 
All through the thundering waves of Winter, the ship has pressed on across the Indian Ocean pausing out sonar signals and this is what they have to show for it.  The most detailed 1 map ever of the sea bed in this area. 16,000 square miles covered crumbling 2 underwater volcanoes, winding 3 valleys, plunging 4 canyon 5 and just maybe the solution to a mystery.  The new map is not find enough to show wreckage 6 but it's a well of information to guide underwater search vessels 7. 
 
"Tom, they makes a great deal of difference because they'll be able to hold a tighter path right above the ocean floor knowing what's coming ahead of times, so they can go a little bit faster and get a lot more done in the last time."
 
Before the search broke off earlier this year, much hope was painted on the Bluefin underwater search robot. It came up empty but now with a new map, a much border search with toll 8 sonar erase 9 is beginning. Australian authorities remain convinced this arch is the right place to look, saying recently refinement 10 to analysis of satellite data about the plane's flight path has given greater certainly about when the aircraft turned south into the Indian Ocean. And that gives a better sense of where it ran out fuel. Most likely south of this submerged mountains called the broken ridge 11 but ...
 
"We have been very cautious about over predicting or over confidence in those preditions that you make or you'll end up exactly where you thought you would but it may not be the right place. "
 
Don't look for people scanning the surface for debris 12. Those days are over.  Now, it's all about looking in some places nearly 4 miles beneath the wave and once again, hoping for a break. The search is scheduled to last for about a year and if they find the plane during that time; of course, it would be a huge step but a big mystery still remains 13 whatever cause this plane to go down. Tom Formans, CNN, Washington.