Why must she interrupt?

她为什么偏要打断呢？

《柯林斯英汉双解大词典》

Why must he do it that way?

他为什么偏要那样做？

《新英汉大辞典》

Why must we treat wastewater?

为什么我们必须处理废水？

youdao

That's why I must decide on something at once while there is still time, before I am famous.

VOA: special.2009.09.20

Why this struggle, and why must Milton struggle with such awkward metaphysical categories in order simply to address properly the power of light?

为什么弥尔顿必须,与这样一个奇怪的抽象的东西斗争,仅仅是为了恰当的描述光明的力量？

耶鲁公开课 - 弥尔顿课程节选

There must be fundamental reasons for it and I wanted to go over some of the fundamental reasons why we have banks.

它的形成必有其根本的原因,下面我就阐述银行产生的一些基本原因,为什么会有银行

耶鲁公开课 - 金融市场课程节选

Mr. HAMILTON: (Singing) Why must they try to tear down the house we're in, babe?

NPR: Anthony Hamilton: 'Ain't Nobody Worryin'

Why must carriers slowly wean themselves from traditional phone networks before moving to Internet Protocol technology?

CNN: Lucent's IP fever

In a poll, why must there be a clear and accurate link between sample and population?

CNN: The Polls