Hit a switch and a light goes on.

碰一下开关，灯就亮了。

youdao

Doesn't it seem a bit unrealistic to be able to walk into a dark space, hit a switch, and instantly fill the entire space with light?

在黑暗空间里行走，碰一下开关，瞬间就会点亮整个空间——是不是显得有些不现实？

youdao

"We don't expect to hit a light switch and boom-50, 000 people will show up, " says Barry Stockhamer, former Dodgers marketing chief, now general manager of the league's Long Beach Armada.

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