在實(shí)驗(yàn)室里，宇航員進(jìn)行太空旅行訓(xùn)練。其所處的環(huán)境與太空飛行的環(huán)境相仿。他們需要花很多時(shí)間準(zhǔn)備適應(yīng)太空中發(fā)生的巨大變化。當(dāng)太空船以極快的速度離開地球時(shí)，宇航員感到他們仿佛被擠壓向宇宙飛船底板。此后，當(dāng)他們離開引力區(qū)時(shí)，他們就無法停留在一個(gè)地方。就連吃飯、喝水等簡(jiǎn)單動(dòng)作都變得非常困難。假如你在倒立或躺臥時(shí)試圖喝一杯水，那么你就會(huì)對(duì)宇航員必須應(yīng)付的環(huán)境略有了解。

In the laboratories where astronauts are trained for their journeys, they are subjected to conditions that resemble those of flight. It take time for them to prepare for the great changes that occur in space. When the space ship leaves the earth at tremendous speed, the astronauts feel as if they are being crushed against the spaceship floor. Later, when they leave the zone of the earth’s gravitation, they are unable to stay in one place. Simple actions, such as eating and drinking, become very difficult to perform. You may get an vague idea of what the astronauts have to deal with if you try to drink a glass of water while standing on your head or while just lying down.

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