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- 乔抢先了一步，他在我们开始之前就已准备功课了。
Joe has a head start. He began to study earlier than we did.
- 他们未得许可就抢先盖了汽车房。
They jumped the gun by building the garage before permission had been given.
- 我们没等他们（提出）投诉而抢先写好了一份详尽的报告。
We anticipated their (making a) complaint by writing a full report.
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