... twinstringdual-completion双管两层完井 twirl转动；旋转的东西；螺旋形的东西；快速转动 twistbreakmethod解捻法 ...
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事实上，即使旋转坐标系到某个平面，还是可以做到一样的东西。
In fact, if I rotated my coordinates to fit with any other plane, I could still do the same things.
如果你流体中放些漂浮物，很轻的东西，然后开始旋转。
If you put something that floats, for example, in your fluid, something very light then it is going to start spinning.
旋转东西有多难，换着来讲的话，是跟转动惯量有关的。
How hard it is to spin something, on the other hand, is given by its moment of inertia.
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