例句：
He considers himself an expert on the subject.
他認為自己是這門學科的專家。
He earned a reputation as an expert on tax law.
他贏得了稅法專家的美名。
We employ an expert to advise on new technology.
我們聘用了一位專家擔任新技術顧問。
I don't profess to be an expert in this subject.
我不敢自詡為這方面的專家。
Harvey cured the pain with his own expert hands.
哈維用他那行家之手治愈了那病痛。