tonight的意思是“(在)今夜”“(在)今晚”,可指全夜,也可指就寝以前的一段时间,可用作副词,在句中作状语,常用于句末。
eg. Taxis seem very thin on the ground tonight—we will have to talk.
Don't let on to Doris that we are going to the movies tonight, we don't want her to know.
I'm staying home tonight to attend on my father.
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