unacquainted

1.I regret that I am unacquainted with the place.

遗憾我对这地方悉。

2.unacquainted with the legal issues at hand.

知道手头的法律争议

3.8.I am at an unfavourable position in being conversationally unacquainted with English.

我由于悉英语会话而处于利地位。