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The square has four sides, and the circle has no sides.

正方形有四条边，而圆形没有边。

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Other answers include the question being a contradiction, like a “square circle”.

其他的回答指出这个问题本身就是矛盾的，就像“正方形的圆”一样。

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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

耶鲁公开课 - 基础物理课程节选

It will be the first "Romeo and Juliet" on Broadway since Paul Ryan Rudd and Pamela Payton-Wright played the doomed lovers in a 1977 Circle in the Square production.

WSJ: Bloom, Rashad in Broadway's 'Romeo and Juliet'

You will be able to select blocks on the touchscreen or just scroll through them with the circle and square buttons on the Xperia Play device.

ENGADGET: Minecraft Pocket Edition hits Android Market, only Xperia Play users need apply

The need to square the circle is an occupational hazard in politics, that doesn't sound like a "total rejection" to me.

BBC: Local benefit caps: Labour try to square the circle