But why must roosters crow as they prepare to start their day, and why do some roosters sound off before dawn?
但是，为什么公鸡会打鸣呢？而且偏偏是在黎明前呢？
As the subject of purpose, why must people observe those external tool norms? It is necessary to understand the theory about the moral origin again.
作为目的性的主体存在，人为什么要去遵守那些外在的工具性规范呢？为此，有必要重新解读关于道德起源的学说。
为什么我们必须处理废水？
为什么他们一定要戴红帽子？
Why must we close that chemical factory?
我们为什么一定要关闭那家化工厂？
Why must portholes of naval ships be round?
舰艇舷窗为什么都是圆的？
Why must my global variable be declared as a pointer?
为什么我的全局变量必须声明为指针？
Why must you be talking so loudly while others are studying?
为什么在别人正学习的时候，你非得这么大声说话呢？
Why must you live in this small house when you could move into a much larger one?
你本来可以搬到一间大一些的屋子去住，为什么偏偏要住在这间小屋里？
Why must big animals invest so much time and energy just keeping the little ones alive?
为什么仅就为养活自己的孩子，大型动物就必须投入那么多时间和精力呢？
Why can't I cook with hot tap water? Why must it be cold, even if I'm going to heat it anyway?
为什么不能用热的自来水做饭呢？即使我是要进行加热，为什么一定要用冷的自来水呢？
Why must we be so obsessed with turning travel-and our lives-into checklists of things to accomplish?
为什么我们非要一门心思的把旅行或我们的生活变成一条条可实现的清单式的目标呢？
"Why must we move to another classroom just because someone new is coming?" One of them asked angrily.
“为什么仅仅因为来了一个新同学，我们就必须搬到另一个教室去？”其中一个生气地问。
He added: "We were born in this area, we went to school here, we know the area and know all the people here. Why must we move out?"
他补充说：“我们生在这儿，在这儿上学，熟悉这儿的一草一木，对这儿的所有人知根知底，为什么要我们搬出去？”
He added: "We were born in this area, we went to school here, we know the area and know all the people here. Why must we move out?"
他补充说：“我们生在这儿，在这儿上学，熟悉这儿的一草一木，对这儿的所有人知根知底，为什么要我们搬出去？”
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