“但是为什么…？”她的声音细了下去。

'But why...?' Her voice tailed away.

《牛津词典》

但是为什么她站在一个穿校服的男生旁边？

But why she stands beside a boy in a school uniform?

youdao

但是为什么要学习不同的文体，才能理解乔伊斯的小说呢？

But why do I have to study different styles to understand Joyce's novels?

youdao

But, you know why not do something a little special, little different, and they decided instead to use lithium.

但是你懂的，为什么不做的更特殊，更与众不同一些呢？

麻省理工公开课 - 化学原理课程节选

I said that if I was really hygienic, and you can now wonder about how often do I shower?

但是这真的很棒，对不对？,那么为什么我要说这些呢？,我说过如果我真的很讲卫生的话？

麻省理工公开课 - 计算机科学及编程导论课程节选

But I want you guys to think about why it was difficult to do it another way, which is more pedestrian.

但是我希望你们能思考一下,为什么用另一种更普遍的方法来做,反而会比较难呢

耶鲁公开课 - 基础物理课程节选