人一定要有国家!
Some one must have slipped it slyly into my pocket for a joke.
一定是有人捉弄我,偷偷地把它塞进了我的口袋。
To go in for technical innovation, one must have the fearless spirit of a pathbreaker.
搞技术革新就要有一股不怕困难的闯劲。
They must have attended their American school for at least one year.
VOA: special.2009.01.29
A famous mathematician once said "Every question must have a correct answer " for every question one answer."
一位著名的数学家曾说过,“每一个问题都必定有一个正确的答案,每一个人们所回答的问题“
And one thing that Einstein put forth is he figured if well, what we're saying is that light is, in fact, a stream of particles, each one of those particles or photons must, therefore, have a momentum.
爱因斯坦提出了一件事情,他指出如果我们所说的光,事实上是一束粒子,那么这些粒子或者光子中的,每一个都有动量。
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