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As表示“一边……一边”，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强调“一先一后。例如：
We always sing as we walk.
我们总是边走边唱。（as表示“一边……一边”）
As we were going out, it began to snow.
当我们出门时，开始下雪了。（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）
You can feel the air moving as your hand pushes through it.
当你的手在空气中挥动的时候，你就能感觉到空气在流动。
Our headmaster laughed as she spoke.
我们的校长边谈边笑。
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