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."
向东航行了几天后，我到达了澳大利亚，在那儿我找到了一艘返回欧洲的轮船。
After several days travelling eastwards, I arrived in Australia, and from there managed to find a ship returning to Europe.
洞穴中的一些剩余木材显示，每当船只经过数月航行最终返回时，它们会被送往洞穴进行拆卸，工人们检查船只各个部位的破损和断裂情况。
Timber remains at Wadi Gawasis demonstrate that when ships returned from several months at sea, they were disassembled in the caves, and the parts were inspected for wear and tear.
因此，乔治·布什重新规划了美国太空机构——国际航空和宇宙航行局的任务，从科学研究转为2004年有人驾驶飞船返回月球，许多科学家都感到失望。
So when George Bush redirected America's space agency, NASA, away from scientific research and towards a manned return to the moon in 2004, many scientists were disappointed.
美国国家航空和宇宙航行局的高层大气研究卫星，简称UARS，预计将于九月末返回大气层。
NASA's Upper Atmosphere Research Satellite, or UARS, is expected to reenter the atmosphere at the end of September.
美国国家航空和宇宙航行局的高层大气研究卫星，简称UARS，预计将于九月末返回大气层。
NASA's Upper Atmosphere Research Satellite, or UARS, is expected to reenter the atmosphere at the end of September.
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