He flicked a switch and all the lights went out.

他啪的一声按了下开关，灯全熄了。

《牛津词典》

With a lightning "switch" at their fingertips, materials scientists could find out what happens when mighty currents meet matter.

有一个便于取用的闪电“转换器”，材料科学家们就可以弄清当强大的电流与物质相遇时会发生什么。

youdao

Turn the light off as you go out.; Please switch off the lights when you leave.

出门时请随手关灯。

《新英汉大辞典》

Now let me switch to the implicit purposes of socialization and time-out.

现在转到深层目标,社会化和腾时间。

麻省理工公开课 - 媒体、教育、市场课程节选

He will recommend the council agrees to switch to all-out elections to coincide with the next election for a mayor in 2016.

BBC: Bristol City Council could save ?1m in voting change

Bristol elects a third of its councillors at a time, but from 2016 will switch to all-out elections to be held every four years.

BBC: Local elections 2013: Lib Dems lose nine seats in Bristol

Canned or dried food keeps well, but switch out non-perishable food about every six months to keep your disaster kit fresh.

CNN: Food Central - Y2K supplies: A preparedness checklist - December 9 , 1999