... Defense of the present system 维护现状 Definition of terms 定义语词；正方定义 Desirability 损益性；可欲性 ...
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您可以通过定义对象的绘制方式来旋转您的正方形。
You can rotate your square by defining how you draw your object.
所以速度的符号,和平均加速度的符号,这二者都取决于,这里x正方向,是如何定义的,和0点的选取没有关系。
So the signs in the velocity and the signs in average acceleration depend crucially on how I have defined my increasing value of x not where I choose my zero points.
我们可以把正方形定义为四边相等的矩形。
We may define a square as a rectangle with four equal sides.
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