他们可以在未知的海域航行数天，并对该地区进行评估。他们知道如果没有发现任何东西的话，他们可以掉头，并借着信风迅速返回。
They could sail out for days into the unknown and assess the area, secure in the knowledge that if they didn't find anything, they could turn about and catch a swift ride back on the trade winds.
经过25年的职业生涯之后，亚特兰蒂斯后航天飞机正在从国际空间站返回地球，这是其最后一次航行。
The space shuttle Atlantis is on its way back to earth from the International space Station on its last voyage after a 25-year career.
正是在环球航行返回几个月之后，达尔文才第一次真正严肃地思考进化- - -或者“物种变异的”可能性。
It was a few months after returning from this voyage that Darwin first began to consider seriously the possibility of evolution, or the "transmutation of species."
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