expert

n. /ˈekspɜːrt/ A2

专家；行家

A person with special knowledge or skill in a particular area.

仙境例句

The Rabbit's servant was no expert on arms, but he knew one when he saw it in a window.

白兔的仆人不是认胳膊的行家，可窗户里伸出一条胳膊，他一眼就认得出来。