to go around or through something, or to make something go around or through something

Hot water circulates through the heating system. 热水在供暖系统中循环。

I've circulated a good luck card for everyone to sign. 我拿了一张好运卡传着让每个人都签名。

to move around at a party, etc., talking to different people

I try to circulate at a party and not just stay with the friends I came with. 聚会上我尽量来回周旋广交朋友，而不仅仅只和跟我一道来的朋友们在一起。