Jason was one of the engineers ①who came from Russia in the 1950s. When he came to China, the first thing ②that he did was to visit the factory ③which did research on buses.Then he spent every minute that he could spare to help China to develop transportation. Although Jason was a foreigner ④whose nation also needed him especially, he decided to make contributions to our country's development. Jason was really a person ⑤whom we ought to say thanks to.
翻译如下：
Jason was one of the engineers ①who came from Russia in the 1950s.
杰森是一个（于20世纪50年代从俄罗斯来的）的工程师。
When he came to China, the first thing ②that he did was to visit the factory ③which did research on buses.
当他来到中国时，第一件（他做的）事情是参观（研制汽车的）工厂。
Then he spent every minute that he could spare to help China to develop transportation.
之后，他的每分每秒都在帮助中国发展交通工具。
Although Jason was a foreigner ④whose nation also needed him especially, he decided to make contributions to our country's development.
尽管，杰森是一个（他的国家也特别需要他的）外国人，但是他还是决定留下来，为中国的发展做贡献。
Jason was really a person ⑤whom we ought to say thanks to.
杰森就是这样一个（我们应该对他说声感谢的）人。
1．加黑处①who引导定语从句时，指人且在从句中作主语。
2．加黑处②that引导定语从句时，指物且在从句中作主语或宾语。
3．加黑处③which引导定语从句时，只能指物且在从句中作主语或宾语。
4．加黑处④whose引导定语从句时，既可以指人，也可以指物，表示所属关系，只能在从句中作定语。
5．加黑处⑤whom引导定语从句时，指人且只能在从句中作宾语。