You can wait for some element or text to be present or not.
您可以等待一些元素或文本出现或者不出现。
The layman often has some difficulty understanding text or internal design of a book.
外行人常常遇到一些困难，理解文本或内部设计的一本书。
The layman often has some difficulty understanding text or internal design of a book.
外行人常常遇到一些困难，理解文本或内部设计的一本书。
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