For every one hour, they will spend on a spacewalk, astronauts need to train seven hours in the pool.

宇航员在太空漫步中花费的每一个小时，都是他们在泳池里训练7个小时换来的。

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When on a spacewalk, astronauts use safety tethers to stay close to their spacecraft.

当宇航员在太空行走时，他们会使用安全绳以保持他们与飞船的距离。

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Astronauts on a spacewalk cannot whistle.

太空行走的宇航员不能吹口哨。

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But the shutters stayed closed until after astronauts removed the windows' protective covers during a nearly six-hour spacewalk Wednesday.

VOA: standard.2010.02.18

The French launch coincides with the anticipated spacewalk of U.S.Astronauts John Grunsfeld and Drew Feustel who are expected to exit the space Shuttle Atlantis for the first of five spacewalks to upgrade Hubble telescope.

VOA: standard.2009.05.14

On Saturday afternoon, NASA astronauts Chris Cassidy and Tom Marshburn successfully completed a spacewalk to repair a leaky component on the outside of the International Space Station.

FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak

Its astronauts Steve Swanson and Richard Arnold undertook the six-hour, seven-minute spacewalk required to install the truss.

BBC: Spacewalkers bolt in power unit