They were angered by his presumption.是什么意思？

They were angered by his presumption.

他们对他的放肆感到非常愤怒。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

angered

v. （使）发怒，激怒( anger的过去式和过去分词 )；

例句
The decision to allow more offshore oil drilling angered some Californians.
允许进行更多近海石油钻探的决定激怒了一些加利福尼亚人。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

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

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。

presumption

n. 推测，设想，放肆，傲慢，<律>推定；

例句
They may be hoping to invert the presumption that a defendant is innocent until proved guilty.
他们可能有望颠覆“被告在证实有罪之前是无辜的”这一假设。