theme

The book’s theme is the conflict between love and duty.

本书的主题是爱与责任之间的冲突。

Nature is a recurrent theme in Frost’s poetry.

大自然是弗罗斯特诗作中反复出现的一个主题。

Most of Kurt’s other pictures were variations on the same theme .

库尔特的其他大部分画作都是同一主题的变奏。