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1. It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.
    不久,一架直升飞机飞到现场,来搭救失事飞机的幸存者。

2. It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.
    不久,一架直升飞机飞到现场,来搭救失事飞机的幸存者。

3. It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.
    不久,一架直升飞机飞到现场,来搭救失事飞机的幸存者。

4. It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.
    不久,一架直升飞机飞抵飞机失事现场,来搭救这几个幸存者。