Senior politicians connived to ensure that he was not released.是什么意思？

Senior politicians connived to ensure that he was not released.

几位资深政治家串通起来确保他不会获释。

senior

adj. （级别、地位等）较高的，资深的，年长的，<美>最高年级的；n. 上级，<美>毕业班学生，较年长者，地位较高的，资历较深的；

例句
A role as senior diplomat would be a good alibi for his absence.
高级外交官的角色将是他缺席的上佳托词。

politicians

n. 政治家( politician的名词复数 )，政客，玩弄权术者；

例句
I am sick of all the quarrelling among politicians who should be concentrating on vital issues.
我厌恶政客间的所有那些争吵，他们本应把注意力集中在重大问题上。

connived

v. 密谋 ( connive的过去式和过去分词 )，搞阴谋，默许，纵容；

例句
Senior politicians connived to ensure that he was not released.
几位资深政治家串通起来确保他不会获释。

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。

ensure

vt. 确保，担保获得[避免]，使（某人）获得，使安全；

例句
...an effort to ensure that the disabled achieve real acceptance.
为确保残疾人真正得到接纳而作出的努力

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

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。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

not

adv. 不，[用以表示否定、否认、拒绝、禁止等]不是，几乎不，未必，没有[用于否定后面的词或短语]；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

released

v. 释放( release的过去式和过去分词 )，放开，发布，发

例句
At 3.30 p.m. a bulletin was released announcing that the president was out of immediate danger.
下午3点30分发布了公告，称总统已经暂时脱离危险。