我的哥哥是个大学教授，他教经济学。
My brother is a member of the faculty, he teaches economics.
我的哥哥是个大学教员，他教经济学。
My brother is a member of the faculty. He teaches economics.
他在1978年被授予诺贝尔经济学奖，舆论普遍表示讶异，因为此时他已有二十年不教经济学了。
He was awarded the Nobel Prize for economics in 1978, to considerable surprise, since by then he had not taught economics for two decades.
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