Gradually he became silent.是什么意思？

Gradually he became silent.

渐渐地他变得沉默寡言了。

gradually

adv. 逐步地，渐渐地，按部就班地，日趋，冉冉；

例句
He has gradually acquiesced to the demands of the opposition...
他渐渐顺从了反对派的要求。

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。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

silent

adj. 沉默的，无言的，寂静的，无声的，静止的，[语]不发音的；n. 无声电影；

例句
He looked back at the abject, silent girl and repeated his question.
他转过头看着这个噤若寒蝉的女孩，又重复了一遍他的问题。