之后8位警察花了两年时间搜寻证据。用英语怎么说？

之后8位警察花了两年时间搜寻证据。

Eight policemen then spent two years combing through the evidence.

eight

num. 八，八个，第八；n. 八，八人（或物）一组，八人划船队；adj. 八个的；

例句
One in eight women lives in an abusive relationship.
每八位女性中就有一位遭受伴侣的虐待。

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。

then

adv. 那时，然后，那么，话说回来；adj. 当时的，那时的；

例句
Liz adjusted her mirror and then edged the car out of its parking bay.
莉兹调了调后视镜，将车子挪出了停车位。

spent

adj. 用过的，不再有用的，已废的，失效的；v. 用钱，花钱( spend的过去式和过去分词 )，花费，消耗，花（时间）；

例句
He has spent money with gay abandon...
他肆意挥霍钱财。

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；

例句
His wife was sentenced to seven years imprisonment for aiding and abetting him...
他的妻子作为他的从犯被判入狱7年。

combing

n. 梳毛，梳弃的毛或发；v. 梳理( comb的现在分词 )，在…搜寻，彻底搜查；

例句
I was combing my hair and it was just falling out in clumps.
我梳头的时候，头发一团一团地往下掉。

through

prep. 通过，穿过，经由，透过，凭借；adv. 从头到尾，彻底，自始至终；adj. （电话）接通，通话完毕，有洞的，直达的；

例句
The proposal was instantly voted through with two to one in favour, accompanied by enthusiastic applause...
在热烈的掌声中，提案以2比1的优势很快通过了表决。

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。

evidence

n. 证词，证据，迹象，明显；vt. 使明显，显示，表明，证实；

例句
...scientific evidence that did not fully accord with the facts uncovered by the police.
与警方所掌握的情况不完全一致的科学证据