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When astronauts return from long missions in space, their exit from the spacecraft is usually hidden from public view.
當宇航員結束太空的長期任務返回地球時，他們走出太空飛船的畫面往往不會曝光。
This is because after several months in weightless conditions, things we usually take for granted,
這是因為在失重狀態下生活了數月，一些我們認為理所當然能夠做到的動作，
such as walking and keeping our balance, present great difficulties for the astronauts.
如走路或保持平衡對宇航員來說十分困難。
Forces Around Us
環繞四周的力量
The culprit is gravity, or the virtual lack of it in space.
罪魁禍首是地心引力，或者說太空沒有地心引力。
Gravity is the force with which particles of matter attract each other.
地心引力是指物質粒子相互吸引的力量。
The greater its mass, the stronger an object’s gravitational force.
一個物體質量越大，其地心引力越大。
That’s why we normally stay rooted to the surface of the earth instead of floating off; the earth’s mass is much greater than ours.
由于地球的質量遠大于我們，所以我們可以一直站在地球表面而不會漂浮在空中。
譯文為可可英語翻譯，未經授權請勿轉載!
