Remember, we take the derivative of the square. We take twice this quantity times the derivative of what we are squaring.
还记得吧，对一个量的平方求导，就得到这个量的2倍，乘以这个量的导数。
Pneumatic squaring head can square the sawtooth edge produced by disc heads, with smooth and flat edges.
其中气动修边能有效地消除碟形磨边所产生的锯齿状边，使砖坯周边光滑平整。
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