circulate
v. （液体或气体）环流，循环；传播，流传；传阅，传送；来往应酬，周旋
第三人称单数 circulates
现在分词 circulating
过去式 circulated
过去分词 circulated
例句
Draughts help to circulate air.
通风有助于循环空气。
《柯林斯英汉双解大词典》
Leave a gap at the top and bottom so air can circulate.
在顶部和底部各留一点空隙，这样空气就可以流通了。
Rumours began to circulate about his financial problems.
有关他财务困难的谣言开始流传开来。
《牛津词典》
