使用不具转换功能的样式表 — 实际上指不执行任何操作但回转所接收的输入内容的样式表 — 称作 标识转换（identity transformation）。

Using a non-transforming stylesheet—essentially a stylesheet that does nothing but echo out what it receives as input—is called an identity transformation.

youdao

该机械式动画装置可以安装于钟、表或者其他具有回转机构并可以提供回转动力的产品上，从而产生动画效果。

The mechanical cartoon device can be arranged on a clock, a watch and other products that are provided with the swing mechanisms and can provide the swing power, so as to give the cartoon effect.

youdao