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The mathematician walked around in a circle.
VOA: special.2009.03.28
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But the speeches of Glaucon and Adeimantus, you might say the circle around Socrates is effectively closed.
但，Glaucon，与，Adeimantus，的发言，你也可以说,那环绕着苏格拉底的圈子实际上是封闭的。
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open your textbook and put a circle around question number one.
打开你的课本，在第一个问题上画一个圈。
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But I think as time went on after the Rose Revolution, I think he wanted to perpetuate this kind of system in which there was really absence of checks and balances, no real opposition included in the political process very much sort of governing by committee of the inner circle, of loyal allies around the president.
VOA: standard.2009.09.01
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I have shown you yesterday that the speed of the particle as it goes around the circle is this .
我昨天讲过,质点做圆周运动的速率等于这个
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These are some minor characters who lived with them and went to Columbia with them, or were in their circle when these writers lived in the neighborhoods ] in New York around Columbia University.] So, Allen Ginsberg is Carlo Marx, and Ginsberg went to Columbia.
这些是和他们住在一起的次要人物,和他们一起去了哥伦比亚的，或者当作者住在,纽约哥大附近的那个小区时,是他们圈子里的人],因此，艾伦金斯堡就是卡洛马克思，金斯堡去了哥大。
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When a body is going around a circle, they say that's some centrifugal force acting.
如果一个物体做圆周运动,他们就说有离心力作用于这个物体
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It's related to the frequency with which you go around the circle Why is that?
它也跟圆周运动的频率有关,为什么呢
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This describes a particle that's going around in a circle.
这个式子描述了质点的圆周运动
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It's going around a circle.
它沿着圆周运动
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That means, it can only be rattling around in a circle of radius R.
也就是说它只能,限制在一个半径为 R 的圆上运动
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We know it's going around in a circle because if I find the length of this vector, which is the x-square part, plus the y-square part, I just get r square at all times, because sine square plus cosine square is one.
我们之所以知道它做圆周运动,是因为我求出了这个矢量的模长,也就是 x 的平方加上 y 的平方,我就得到了它在任意时刻的模长平方,因为正弦平方加余弦平方始终等于1
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