英语翻译他在一家外资企业工作已经10年了.（现在完成时）2010年回国之前,他在美国工作.（过去完成时）2010年回国之后,他一直在当保安.（过去完成时）

He has worked in a foreign company for 10 years.
He had worked in America before he returned home.
He has been working as a security guard since he returned home.

He has worked in a foreign enterprise for ten years.
He had worked in America before returning to China in 2010.
He had worked as a guard since he back to China in 2010.

1 He has worked in a foreign company for ten years.
2 Before he returned in 2010, he worked in US.
3 Before his return in 2010, he had worked as a security guard.

He Has worked in a foreign-owned company for 10 years.
he had worked in USA beforehis return in 2010.
he had been a safeguard before his return in 2010.

He has worked in a foreign company for 10 years.
He had worked in America before he returned home in 2010.
He worked as a security guard since he returned home in 2010.