by accident ,by mistake ,这里by表示什么用法,

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by accident ,by mistake ,这里by表示什么用法,

这里的by是介词,构成介词短语.by accident ,by mistake都是方式状语.

(用于短语中)由于,出于(偶然或意外) You use by in phrases such as 'by chance' or 'by accident' to indicate whether or not an event was planned.