The crickets stridulated their everlasting monotonous meaningful note.

蟋蟀发出了它们持久的，单调而有意思的调子。

I used to try to beat past records to add zest to my monotonous job.

我过去常常努力赶超以前的成就以给单调的工作增加刺激。

The monotonous voice of the movement of the train lulled me to sleep.

火车运行是单调的声音使我昏昏欲睡。