at home in

熟悉, 精通

例句与用法：

The dance girl is quite at home in front of strangers.

那个跳舞女郎在生人面前没一点紧张。

I'm always at home in the evenings.

晚上我总是在家里。

At home in sth.

精通; 擅长

Is it difficult to feel at home in (ie confident when using) a foreign language?

精通一门外语难不难?

The Canadian-Japanese is at home in both languages.

那个加拿大籍日本人两种语言都精通。