阅读时不允许倒退回去读，而要保持每一句话都向前阅读，甚至当你遇到一个新词时也不能退回去。
While reading do not allow yourself to regress, but keep reading ahead in every sentence, even when you come across a new word.
如果读操作成功，则流内的当前位置将向前推进读取的字节数。
If the read operation is successful, the current position within the stream advances by the number of bytes read.
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