They were shocked by the impropriety of the young man's action.是什么意思？

They were shocked by the impropriety of the young man's action.

他们为那年轻人的不当举止而感到震惊.

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。

shocked

adj. 惊愕的，受震惊的；v. 使…震惊( shock的过去式和过去分词 )，使受电击，使…感到厌恶[恐惧]；

例句
The loss of the biggest ship in the Royal Navy shocked the Admiralty.
皇家海军损失最大舰艇一事震惊了英国海军部。

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

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。

impropriety

n. 不得体，不适当，不得体的举止，不正确；

例句
I would certainly dismiss any allegations of impropriety by the Labour Party...
对于工党指责我行为不正当，我当然不会理会。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

young

adj. 年幼的，有朝气的，年轻人的，青年的；n. 年轻人，幼小的动物，崽；

例句
...incentives to private landlords to accept young people as tenants.
鼓励私人房东租房给年轻人的措施

action

n. 行动，活动，功能，作用，手段，[法]诉

例句
The government is taking emergency action to deal with a housing crisis...
政府正采取紧急措施解决住房危机。