expert in的用法和樣例：
例句
- I don't profess expert knowledge of/to be an expert in this subject.
我並不自詡對這一問題內行[是這一問題的專家]。 - He's an expert in electronics.
他是電子應用專家。 - She poses as an expert in old coins.
她自詡為古錢幣專家。 - Tom is expert in writing report.
湯姆對寫報告很內行。 - He is a well-known expert in finance.
他是知名的金融專家。 - He is an expert in unarmed combat.
他是徒手格鬥的能手。
