Our association with him goes back four years.是什么意思？

Our association with him goes back four years.

我们同他的合作是从4年前开始的。

our

pron. 我们的，we的所有格形式，<口>我们家，敝；

例句
Roland was taken aback by our strength of feeling...
我们反应如此强烈，令罗兰大吃一惊。

association

n. 协会，社团，联合，联系，联想；

例句
All members of the association adhere to a strict code of practice...
协会的所有成员都遵守一套严格的行为规范。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。

goes

v. 进行（go的第三人称单数），去，离开，进展；n. （牌戏、下棋等中）轮到的顺序（go的复数形式）；

例句
I don't want to be left holding the bag if something goes wrong.
如果出了什么问题，我可不想替人背黑锅。

back

n. 背，背部，背面，反面，后面，后部，（椅子等的）靠

例句
He looked back at the abject, silent girl and repeated his question.
他转过头看着这个噤若寒蝉的女孩，又重复了一遍他的问题。

four

num. 四，四个，第四；n. 四个人（或事物）的一组，得四分的一击，四人赛艇；

例句
His car was held up and he was abducted by four gunmen...
他的车遭遇拦劫，随后他被4名持枪歹徒劫持。

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。