开关在任何时候都仅仅是控制着完全开和关。灯也确实是一样。

The switch can only be either totally on or totally off at any given time. The same is true for the light.

youdao

开关在任何时候都仅仅是控制着完全开和关。灯也确实是一样。

The switch can only be either totally on or totally off at any given time. The same is true for the light.

youdao