n. rectification ; squaring
单个弧是不能求长的。
运作原理是这样的:由于在欧元区定协议建立一个共同的财政部会需要相当长的时间,在此期间,各成员国必须求诸欧洲央行,让它来填补这个真空。
This is how it would work.Since a eurozone treaty establishing a common Treasury would take a long time to conclude, in the interim the member states have to appeal to the ECB to fill the vacuum.
这种中庸人格既有重现实、讲实际、倡和谐等突出的优长,也包括了搞调和、易守旧、求自保,缺乏峭直不平之气等消极因素。
This moderate personality has such advantages as pragmatism, practicality and harmony, but it also has some negative elements including reconciliation, conservatism, fogyism and self-preservation.
If you give me a pair of numbers, Ax and Ay, that's as good as giving me this arrow, because I can find the length of the arrow by Pythagoras' theorem.
如果给我一组数字,Ax 和 Ay,就相当于给了我这个箭头示意图,因为我可以利用毕达哥拉斯定理定理求出模长
take the derivative of this, get the velocity vector and you notice his magnitude is a constant Whichever way you do it, you can then rewrite this as v square over r.
对这个式子求一次导,就能得到速度矢量,你会发现其模长是常数,不管用什么方法,加速度也可以写成 v^2 / r
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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