But once passed, it is gone forever.
而时间一旦度过，便永远地一去不返。
Once a ship passed by the island.
曾经有一只船经过岛屿。
Summer passed youth, who remember which was once a year.
走过青春的夏天，谁还记得曾是哪年。
Once the man got the bird home, however, not another word passed his beak.
然而，这人一把这鸟带回家，它就一个字也不说了。
Once you have passed your test I'll let you drive my car.
你考试通过了之后，我就让你开我的车。
The car passed over the body twice, once backward and then forward .
那辆车把那人来回轧了两次，先是倒着轧的，再是往前开着轧的。
Once youth passed, we will lose vigor!
可青春一旦逝去，我们将失去活力！
Once youth passed, we will lose vigor!
可青春一旦逝去，我们将失去活力！
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