请qǐng保bǎo持chí联lián系xì。

Please stay in touch.

我wǒ会huì联lián系xì你nǐ。

I'll contact you.

他tā们men之zhī间jiān有yǒu联lián系xì。

There is a connection between them.

有yǒu事shì请qǐng随suí时shí联lián系xì我wǒ。

Please contact me anytime if anything comes up.

我wǒ们men已yǐ经jīng多duō年nián没méi联lián系xì了liǎo。

We have not been in contact for many years.