不到二十五岁，她就完成了这个任务。
Before she was twenty-five she had accomplished this condition.
菲尔今天得去医院做检查---这对已经卧床十五年的她来说是一项艰巨的任务。
Today Phil has to visit hospital for tests – a difficult undertaking because she is bedbound and has been now for some 15 years.
在作完了七十五次战役任务后，他的飞机被一枚地对空飞弹击毁。
After 75 combat missions, his plane was destroyed by a surface-to-air missile.
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