by and again的意思|示意

All the way she tried to cheer him up by telling him again and again of the coming summer days.

一路上，她一遍又一遍地告诉他夏天就要来了，想使他高兴起来。

He took it apart brick by brick, and put it back together again.

他一块砖一块砖地把它拆开，又重新把它砌好。

I'm traveling again this week by train and I'm excited.

这周我又要坐火车旅行了，我很兴奋。