以 + Noun + 为 + 主题 / Modifier + 主题
The noun 主题 (zhǔtí) means "theme," "subject," or "topic" and refers to the central idea or focus of a discussion, work, or event. It is commonly used in academic, artistic, and everyday contexts when identifying what something is about.
今天会议的主题是如何提高工作效率。
Jīntiān huìyì de zhǔtí shì rúhé tígāo gōngzuò xiàolǜ.
The topic of today's meeting is how to improve work efficiency.
这部电影的主题是关于亲情和成长的。
Zhè bù diànyǐng de zhǔtí shì guānyú qīnqíng hé chéngzhǎng de.
The theme of this movie is about family love and growing up.
他的演讲紧扣主题,内容非常精彩。
Tā de yǎnjiǎng jǐnkòu zhǔtí, nèiróng fēicháng jīngcǎi.
His speech closely followed the theme, and the content was wonderful.