The stroy was set in the 17th century.故事发生在17世纪.请问这里为什么翻译成英文

e set in 以...为背景 这个结构本来就是被动的.
再问： 课文的原文是：He is best known for his novels set in his boyhood world on the river.这里是不是省略了which were?
再答： 你可以看成是省略掉which were 但实际上这句话中的set in 是非谓语动词中的过去分词 做定语。意思和which were set in..一样， 语法不一样