男性裸体人像总是希腊艺术的中心主题。

The naked male figure was always the central theme of Greek art.

《牛津词典》

思维导图是一种基本工具，它将信息与中心主题连接起来。

A mind map is basically a tool that connects information around a central subject.

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我希望作者能够为中心主题以及包含在参考资料中的主题提供更多的指导。

I wish the author had provided more guidance on which topics are central and which are included for reference.

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