损失的主题贯穿了他的大部分小说。

The ___theme of loss runs through most of his novels.

我认为这本书的基本主题非常原创，作者写了许多伟大的小说。

I think that the basic ___theme of the book is very original and the author has written lots of great novels.

这部电影探讨了爱与牺牲的主题。

The film explores the ___theme of love and sacrifice.