I think this is one of the most complex and fascinating subtopics within the subject of happiness.

我认为这是一个在快乐话题中最为复杂、最精彩的子话题。

youdao

A reply and decision may be expected within 7 days if the word Abstract is contained within the Subject Line of the email.

请您于7日内回复，草稿内容概括在邮件的主题行即可。

youdao

The hierarchy can include subject heads, whose meaning is equivalent to the union of subjects contained within the subject head.

层次结构可以包括主题头，它的意义与主题头中包含的所有主题的联合相同。

youdao

One of the most complicated and emotionally charged topics within the larger subject of happiness is the relationship between money and happiness.

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