au fait/ˌəu ˈfeɪ; o`fe/ adj[pred 作表语](French 法) ~ (with sth) fully acquainted (with sth) （对某事物）熟悉; 通晓 It's my first week here so I'm not yet au fait with the system. 我刚来不到一个星期, 对这里的制度还不太熟悉.
牛津英汉双解词典