He touched his head impressively, and I nodded.是什么意思？

He touched his head impressively, and I nodded.

他郑重其事地用手碰碰脑袋, 我也点了点头.

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

touched

adj. 精神失常的，受感动的，有一点，略微带点；v. 接触，触摸( touch的过去式和过去分词 )，吃，涉及，与…有关；

例句
He touched his forelock in mock deference.
他手触额发假装尊敬。

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。

head

n. 上端，头脑，头部，首脑，首长；vt. 用头顶，前进，作为…的首领，站在…的前头；vi. 朝…行进，出发，向…方向移动，船驶往；adj. 头的，在前头的，首要的，在顶端的；

例句
His shaven head accentuates his large round face...
光头使他的大圆脸更加突出。

impressively

adv. 令人难忘地，赫然；

例句
The historical research was impressively diligent.
该项历史研究非常地认真、彻底。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

nodded

v. 点头( nod的过去式和过去分词 )，打盹，打瞌睡，点头致意；

例句
Mitzi nodded a perfunctory acknowledgement as her glass was filled.
杯子被倒满时米芝敷衍性地点头示意。