The arrogance became his protective carapace.是什么意思？

The arrogance became his protective carapace.

这种傲慢态度成了他的保护壳。

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。

arrogance

n. 傲慢，自大，自负，气焰；

例句
The arrogance became his protective carapace.
这种傲慢态度成了他的保护壳。

became

v. 变为，成为（ become的过去式 ）；

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。

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。

protective

adj. 保护的，防护的，保护贸易的；

例句
The arrogance became his protective carapace.
这种傲慢态度成了他的保护壳。

carapace

n. （龟、蟹等的）硬壳；