这里讲的是一次对鸟类归还习性进行的科学试验情况。实验的事实是很确定的。
Here is a scientific experiment on the homing of birds, the facts of which are quite certain.
美国奋进号航天飞机开始了一次雄心勃勃的太空使命。奋进号将向国际空间站送去一个新的科学试验室和…
Space Shuttle Endeavour has launched on an ambitious mission to deliver a new science laboratory and robotic system to the International Space Station.
在航行期间，完成了七项科学试验，这次航行是为下一次载人飞船的发射做准备。
During its flight, seven scientific experiments were carried out. The purpose of the flight was to make preparations for the launch of a manned spacecraft next time.
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