Both boys had good manners, politely shaking hands.是什么意思？

Both boys had good manners, politely shaking hands.

这两个男孩都很有礼貌，友好地握了手。

both

adj. 二者，两者都；pron. 二者；adv. 二者，二者都；conj. 不仅…而且…，…和…都；

例句
The gym can be used by both able-bodied and disabled people.
这家健身房健全和残障人士都可使用。

boys

n. 男孩( boy的名词复数 )，儿子，一帮男伙伴，（对本国士兵的昵称）兵哥哥们；

例句
Another time of great excitement for us boys was when war broke out...
对我们男孩子来说另一个极度刺激的时刻是战争爆发。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

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

good

adj. 好的，优秀的，有益的，漂亮的，健全的；n. 好处，利益，善良，善行，好人；adv. 同well；

例句
This recipe makes a good accompaniment to ice-cream.
这道食谱适合搭配冰激凌。

manners

n. 礼貌，方式( manner的名词复数 )，礼貌，规矩，态度；

例句
This comedy of contemporary manners is told with compassion and acid humour.
这部当代风尚喜剧杂糅了悲悯的情怀和尖酸的幽默。

politely

adv. 有礼貌地，客气地，委婉地；

例句
You can say 'with due respect' when you are about to disagree politely with someone.
(发表不同意见前的谦语)恕我冒昧,恕我直言

shaking

n. 摇动，挥动，震动，震惊；adj. 抖动的，发抖的，颤抖的；v. 摇撼( shake的现在分词 )，（使）颤抖，握手，动摇；

例句
I didn't think about the danger at the time. Afterwards I was shaking like a leaf.
我那时候没想到有危险，事后我吓得直发抖。

hands

n. 手( hand的名词复数 )，人手，（工具等的）把，帮助；

例句
He lifted his hands above his head...
他将双手举过头顶。