伊泽贝尔，就是他的兄弟，以前曾经听说过这个笑话。

Isobel, whose brother he was, had heard the joke before.

《牛津词典》

伊泽贝尔，就是他的兄弟，以前曾经听说过这个笑话。

Isobel, whose brother he was, had heard the joke before.

《牛津词典》