你知道这条河有多深吗？
这条河有多深？
这河有多深？
小马背着麦子又回到了河边。他终于成功地过了河。现在，他知道河有多深了。
The little horse carries the wheat and returns to the riverside. At last, he succeeds in crossing the river. Now, he knows how deep the river is.
好比你问“这条河有多深”，除非是人工运河，否则其深度会因地点和时间变化而不同。
It's a bit like asking "How deep is the river?" Unless it's a man-made canal, a river's depth varies from place to place and time to time.
没有再敢在河里游泳了，因为河水已经被污染了，没人知道河到底有多深。
No one dares to swim, because the water is polluted and on one knows how deep it is.
没有再敢在河里游泳了，因为河水已经被污染了，没人知道河到底有多深。
No one dares to swim, because the water is polluted and on one knows how deep it is.
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