His resignation after thirteen years is a political bombshell...是什么意思？

His resignation after thirteen years is a political bombshell...

他任职13年后提出辞职，这在政治上轰动一时。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

resignation

n. 辞职，辞职书，顺从，听从；

例句
The President's resignation appears to be an acknowledgment that he has lost all hope of keeping the country together...
总统的辞职似乎表明他对维护国家稳定已不抱任何希望。

after

prep. …后的，（表示时间）在…以后，（表示位置、顺序）在…后面；conj. 在…以后；adv. 以后，继后；adj. 后来的，以后的；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

thirteen

n. 十三，十三岁，十三个；num. 十三；adj. 十三的，十三个的；

例句
There was evidence that thirteen people in all had taken part in planning the murder.
有证据表明共计13人参与策划了这起谋杀。

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。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

political

adj. 政治的，政党的，对政治有兴趣的；

例句
He has also called for an acceleration of political reforms.
他同时呼吁加快政治改革的步伐。

bombshell

n. 炸弹，爆炸性事件，令人吃惊的事；