但它持续多久了？
持续了多久？
持续了多长时间？
If so, then consider yourself lucky! But how long did it last?
如果是这样，那么你会觉得自己多么幸运！
What did you do for your work experience? How long did it last?
学校给你安排的工作经验，是什么工作？做了多久？
But where did the ancient floodwater come from, how long did it last, and where did it go?
可是古时候的洪水从何而来，持续了多久，最后又去了哪里呢？
How long did it take for extra names to develop into last names?
额外的名字发展成姓氏需要多长时间？
How long did the space flight last? It lasted 21 hour.
航天持续了多长时间？持续了21个小时。
How long did the space flight last? It lasted 21 hour.
航天持续了多长时间？持续了21个小时。
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