不适宜由我说出他离开的原因。
It's not for me to say why he left.
为势所迫，他不得不离开这个国家。
He had to leave the country through force of circumstance.
罪犯正离开现场时，警察逮住了他。
Police collared the culprit as he was leaving the premises.
我离开的时候他们都还在努力工作。
When I left they were all still hard at it.
据信那对夫妇已经离开了这个国家。
It is believed that the couple have left the country.