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科学美国人60秒:进入太空心脏形状改变-托福听力下载

2017-01-05 11:58:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：进入太空心脏形状改变

　　科学美国人60秒中英文翻译：进入太空心脏形状改变

　　科学美国人60秒英文文本

　　This is Scientific American 60 Secomds, Space. I'm Sophie Bushwick, got a minute?

　　When astronauts float weightless in space, their muscles don't need to work as hard as on Earth. Muscles therefore atrophy during a long mission, which can cause trouble when space travelers return home. But what happens to that most vital of muscles, the heart?

　　To find out, 12 astronauts learned how to do ultrasound scans of their hearts. Then they recorded the organ's shape before, during and after a stint on the International Space Station. The scans showed that while in microgravity the astronauts' hearts deformed into more spherical shapes. Back on Earth, they stretched back into their usual elongated forms. The work was presented at the annual scientific session of the American College of Cardiology.

　　心脏.jpg

　　Knowing how weightlessness changes the heart could help mission planners prevent long-term damage to astronauts'cardiovascular systems due to long space voyages. Astronauts on the space station already perform specific exercises to keep their weight-bearing muscles toned. Similarly well-designed workouts might keep hearts both in shape—and in the right shape.

　　Thanks for the minute for Scientific American 60 Secomds, Tech. I'm Sophie Bushwick.

　　中文翻译请点击下一页

本文关键字: 科学美国人60秒 科学60秒下载 托福听力

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