expert at的用法和樣例：
例句
- The leading actor is expert at conveying his role's fine feeling.
這位男主角善於表現他的角色的細膩感情。 - Rex soon became an expert at opening the gate.
Rex很快就成了一個開門能手了。 - She is expert at Chinese boxing.
她的武術練到家了。 - Mr Smith is expert at a lot of things, but he always hides his light under a bushel.
史密斯先生擅長做很多事情，但他從來不表現自己。
