When he was a pilot, he once did not come back home for half a year during a mission.

当他是一名飞行员时，他曾在一次任务期间半年不回家。

youdao

When he was a pilot, he once did not come back home for half a year during a mission.

当他是一名飞行员时，他曾在一次任务期间半年不回家。

youdao