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,

by accident ,by mistake ,这里by表示什么用法,
by accident ,by mistake ,这里by表示什么用法,

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.