fresh off the boat 初来乍到

Newly arrived in another country but has yet to learn the customs and language.

例句：

He's fresh off the boat, and he just arrived yesterday.

他初来乍到，昨天才到的。

She's been here for over a year, but she behaves as if she's fresh off the boat.

她在这里已经一年多了，可她表现得好像是初来乍到似的。