It is worth while to ruminate over his remarks.

他的话值得玩味。

As people grow older, they begin to ruminate on the uncertainty of life.

随着年龄的增，开始对生活的变化无常冥思苦想。

He sat there ruminating and picking at the tablecloth.

他坐在那儿沉思, 轻轻地抚弄着桌布。