Why do the aged tend to be taciturn?

很多老年人沉？

The scholar was reticent, aloof, and meditative.

这位学者少语、离群索居而且总在沉思。

The ant is the most industrious animal; however, it is the most taciturn one.

没有任何动物比蚂蚁更勤奋，然而它却最沉。

He breaks out of his normal reticence and tells me the whole story.

他打破了平时一沈的习惯,把事情原原本本都告诉了我。

Her uncle was a silent, uncommunicative Yankee farmer.

她伯父是一个沉的美国式农民。

He is a man of few words.

他是个沉的人。

Scholars are a quiet breed.

学者们大都沉。

Gradually he became silent.

渐渐地他变得沉了。