In a magnetic disk unit, an arm on which magnetic heads are mounted.
磁盘机中一种用于安装磁头的臂状部件。
Above the unit disk means I don't care about this infinite surface.
在单位圆上方意味着，我不关心无穷远处。
It is going to be this unit disk.
它将会是这个单位圆。
because it's a unit disk. And, the center of mass is the center of a disk.
因为它是一个单位圆盘，这部分的中心就是圆盘的中心。
Now, of course the smart choice would be to just take the flat unit disk.
当然了，最佳选择是用单位圆盘。
Order number of ways: to disk as a unit, not retail sale.
数量订购方式：以盘为单位，不得以零售出售。
Order number of ways: to disk as a unit, not retail sale.
数量订购方式：以盘为单位，不得以零售出售。
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