A subject can be almost anything, from an abstract concept to a specific document section, and the terms subject and topic are often used interchangeably.

题目几乎可以是任何东西，从抽象的概念到具体的文档章节，“题目”和“主题”术语常常交换使用。

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A subject can be almost anything, from an abstract concept to a specific document section, and the terms subject and topic are often used interchangeably.

题目几乎可以是任何东西，从抽象的概念到具体的文档章节，“题目”和“主题”术语常常交换使用。

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