麻花钻用来钻削具有一定尺寸的孔。
A twist drill is designed to drill a hole which has a particular size.
研究发现，一定尺寸的圆柱壳有一个最大临界值。
There is a maximum critical value in the cylindrical shell of certain dimension.
在本教程中，我会要求您创建具有一定尺寸的形状。
During this tutorial I will ask you to create shapes with certain dimensions.
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