He has a security clearance that allows him access to classified information...是什么意思？

He has a security clearance that allows him access to classified information...

他获得了安全许可，可以接触机密信息。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

has

v. 有( have的第三人称单数 )，（亲属关系中）接受，拿，买到；

例句
...the operation a patient has had.
病人做过的手术

security

n. 安全，保证，担保，保护，防护，有价证券；adj. 安全的，保安的，保密的；

例句
You've illegally accessed and misused confidential security files.
你已经非法访问并盗用了机密的安全文件。

clearance

n. 清洁，清扫，[建]净空，空隙，间隙，放行证；

例句
...a slum clearance operation in Nairobi...
内罗毕拆除贫民窟的行动

that

det. 那个，那；pron. 那个，那；conj. 多么，如此…以至，用于某些动词、形容词和名词后，引出各种从句；adv. 不那么，那样；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

allows

v. 允许( allow的第三人称单数 )，承认，酌增，接受；

例句
Warren also allows that capitalist development may, in its early stages, result in increased social inequality.
沃伦也承认资本主义发展初级阶段可能会导致社会不平等现象加剧。

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。

access

n. 入径，通道，机会，权利；vt. 到达，进入，访问，存取（计算机信息）；

例句
The facilities have been adapted to give access to wheelchair users.
这些设施已经改造过以方便轮椅使用者进入。

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。

classified

adj. 保密的，（信息）归入密级的，分类的，归类的；v. 分类( classify的过去式和过去分词)；

例句
Rocks can be classified according to their mode of origin...
可以根据岩石的成因对其进行分类。

information

n. 信息，数据，通知，消息，知识；

例句
Too often he only absorbs half the information in the manual...
他对于说明书上所说的经常是一知半解。