We now keep in touch with him by writing letters.

我们现在靠写信与他保持联系。

youdao

He kept on ringing me up, but I don't want to keep in touch with him any more.

他不断地给我打电话，可我不想和他保持联系了。

youdao

Mom: Oh you know, that guy I worked with 50 years ago, and we just happened to keep in touch. You've met him, he saw your birthing, remember?

妈妈：哦，50年前和我一起工作过的那个家伙，我们只是碰巧保持着联络。你曾经见过他，在你出生的那天，记得么？

youdao

John Major, Mr Blair's Tory predecessor, had relied on a handful of civil servants to prepare his papers and run his diary, and a small Policy Unit to keep him in touch with policy developments in Whitehall.

ECONOMIST: The cafeti��re theory of government