He chewed his lower lip nervously.是什么意思？

He chewed his lower lip nervously.

他紧张地咬着下嘴唇。

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。

chewed

v. 咀嚼，咬( chew的过去式和过去分词 )，（因为紧张等）咬住，不停地啃，（为尝味道）不停地咀

例句
He chewed his lower lip nervously.
他紧张地咬着下嘴唇。

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。

lower

adj. 下方的，在底部的，较低级的；v. 降低，减少，缩小；

例句
...a speech in which he affirmed a commitment to lower taxes...
他作出减税承诺的演讲

lip

n. 嘴唇，（杯，壶等的）口，边缘，〈俚〉无理的回答，〈美〉律师；adj. 唇的，口头上的，唇音的；vt. 用嘴唇接触，接吻，〈俚〉轻轻地说，唱，把高尔夫球打到穴边而未进去；

例句
He chewed his lower lip nervously.
他紧张地咬着下嘴唇。

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。