The doctors will operate if necessary—but it may not come to that.

必要时医生会施行手术，但也许还不致如此。

Wilbur says he's not a coward, but that he's philosophically opposed to war.

威尔伯说他不是个懦夫，但他在哲学观念上反对战争。

It is not the primary tumour that kills, but secondary growths elsewhere in the body.

致命的并不是原发肿瘤，而是在身体其他部位的继发。

I'm not a cook myself but I am interested in nutrition and all that.

我本人不是厨师，但我对营养之类的事感兴趣。

"Not of crocodiles," Hook corrected him, "but of that one crocodile."

“不是所有鳄鱼，”胡克警告他，“而只是那一条鳄鱼的。”