As表示从句动作与主句动作并行, 强调两个动作同时发生。所以常译为“一边……一边……”;有时也可表示从句动作比主句动作早些发生。
例句:
The workers shouted slogans as they passed the square.
They were singing as we were dancing.
The car accelerate as it overtook me。
那辆车超过我时就加速了。(从句动作与主句动作同时发生)
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