但它持续多久了？
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？
持续了多久？
持续了多长时间？
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？
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？
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