请了警察来维持秩序.用英语怎么说？

请了警察来维持秩序.

Police were sent for to maintain order.

police

n. 警察部门，警方，警察，治安；vt. （警察、军队等）巡查，维护治安，（委员会等）监督，管制；adj. 警察的，有关警察的；

例句
A police investigation yesterday absolved the police of all blame in the incident.
警方昨天的调查廓清了其在此事件中的任何责任。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

sent

v. 送( send的过去式和过去分词 )，使作出（某种反应），派遣，使进入（某状态）；

例句
I sent them more than 6,000 cartoons before I had my one and only acceptance by them...
我寄给他们6,000多幅漫画，最后才有1幅得以采用。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

maintain

vt. 保持，保养，坚持，固执己见；

例句
Few people nowadays are able to maintain friendships into adulthood.
如今很少有人能将友谊维持到成年。

order

n. 命令，秩序，规则，制度，次序；vt. 命令，订购，整理；vi. 下订单；

例句
The way that American history is taught may change in order to accommodate some more of those cultures.
美国历史的授课方式可能会为了照顾到更多的文化而作改变。