single-file
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single-file — 副詞
1. one after another in a single line
1.副詞
釋義
排成一列
one after another in a single line
例句
The students walked single-file into the classroom.
single-file — 形容詞
1. arranged in a single line
1.形容詞
釋義
單列的
arranged in a single line
例句
They formed a single-file line at the ticket counter.