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as,while和when均可用作从属连词,引导时间状语从句,作“当……时候”解。它们所引导的时间状语从句有时意思一样,有时却有差异。意
As, while, and when can all be used as dependent conjunctions to guide time adverbial clauses and to solve “when...”. The time adverbial clauses they guide sometimes have the same meaning, but sometimes they have differences. meaning