电灯开关从墙上掉了下来。

The light switch came away from the wall.

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老公要在我们的主浴室里装一个电灯开关，在墙上凿了个洞之后，他发现了一堆隐藏的瓶瓶鑵鑵。

My husband decided to install a light switch in our master bedroom. Cutting into the wall, he discovered a stash of bottles and boxes.

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因此，大体上可以这么形容，在墙上的东西就是开关DNA，手指是调控器，基因表达就是打开灯或关闭灯。

So, very crudely, the thing on the wall is the switch DNA, your finger is the regulator, and gene expression is the light turning on or turning off.

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