随手关灯英语怎么说

"Turn off the lights casually" in English can be expressed as "turn off the lights casually" or "casually turn off the lights". The phrase "casually" is used to indicate that the action of turning off the lights is done without much thought or effort.

Here are some examples of how this phrase can be used in a sentence:

"I'm going to bed, so I'll casually turn off the lights."
"Can you casually turn off the lights when you leave the room?"
"She casually turned off the lights before leaving the office."

The phrase is a simple one, and it is not a set phrase. It is made up of the verb 'turn off' and the noun 'lights' in English. And the adverb 'casually' is used to modify the verb 'turn off' indicating the action is done casually.