Policemen patrol the streets.是什么意思？

Policemen patrol the streets.

警察在街上巡逻。

policemen

n. 警察，（男）警察( policeman的名词复数 )，捕役；

例句
Eight policemen then spent two years combing through the evidence.
之后8位警察花了两年时间搜寻证据。

patrol

n. 巡逻，巡查，巡逻队，侦察队，童子军小队；vt.& vi. 巡逻，巡查；

例句
The team police get to know the people in their patrol areas better than cops who must cover a larger beat.
小分队的警察比那些负责大片区域的警察更了解自己管片的群众。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

streets

n. 大街，街道( street的名词复数 )；

例句
I went round the streets and found his new abode.
我走街串巷找到了他的新住所。