Listing 3 shows the rotation operation as applied to a square.

清单3显示了对一个正方形执行的旋转操作。

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This conceptual setup is materialized by a geometrical operation, the rotation of two elements, as if it were two construction toy blocks that are stacked and handled easily.

这个概念是通过几何运算的操作来实现的，两个元素的旋转，就像是两个积木体一样容易堆放和处理。

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Alternative versions of the showerhead are disclosed in which the spray head is mounted for powered rotation, for example by a motor, allowing remote operation of the showerhead.

公开了淋浴头的可替选的方式，其中，喷头被安装成用于通过动力旋转，例如通过电动机旋转，以允许对该淋浴头进行远距离操作。

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The defence ministry says that to sustain a long-term operation, with a proper rotation system, it ideally likes to have at its disposal three or four ships or aircraft, and up to five army units, for every one deployed at any given time.

ECONOMIST: The army