然后，一个不知姓名的三年级男生说，他的数学笔记落在了图书馆，如果有人看见了，就请交给他。
Then a junior boy whose name I didn't know said he'd left his math notebook in the library and if you saw it, please give it to him.
每次去图书馆，我总看见他坐在同一个位子上看书。
Every time I went to the library, I saw him sitting on the same seat, reading.
这个图书馆是我在美国看见的利用最高的一个。
This library is the one I have seen in America, which is heavily utilized.
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