Once they have left , there is no returning .
他们一旦离开便不再回来。
They had waited once in a spacecraft that never left the ground.
他们在等待一次航天器，从未离开过地面。
The others thought that this was a good plan, and they left at once.
其他人觉得这是个好计划，于是他们马上出发了。
However, when they married, they usually left work at once and never returned to it.
然而，当他们结婚以后，她们都通常马上辞职不干了，而且再也不回去工作了。
Once they have left school or college, many feel that they never want to open a book again.
他们一旦离开校门，许多人再也不愿意碰书本。
Once they have left school or college, many feel that they never want to open a book again.
他们一旦离开校门，许多人再也不愿意碰书本。
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