He cracked his fingers nervously.是什么意思？

He cracked his fingers nervously.

他紧张不安地把手指按得咔吧作响。

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。

cracked

adj. 有裂缝的，声音沙哑的，精神失常的；v. 破裂，崩溃(crack的过去分词)，发沙哑声；

例句
A gas main had cracked under my neighbour's garage and gas had seeped into our homes...
邻居车库下面的煤气总管裂开了，煤气渗入了我们家。

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。

fingers

n. 手指( finger的名词复数 )，指状物，指幅，（手套的）指部；

例句
Yulka's fingers were bloody and cracked.
尤尔卡的手指折断了，鲜血直流。

nervously

adv. 神经质地，焦急地，提心吊胆地；

例句
I cradled my video camera nervously on my lap, but its cold contours did nothing to comfort me.
我紧张地把摄影机架在大腿上，但是它冰冷的外形并没能给我任何安慰。