处理铁轨上的落叶对铁路公司而言是一个耗资巨大的工程。

Leaves on the line are an expensive problem for the railways.

youdao

处理铁轨上的落叶对铁路公司而言是一个耗资巨大的工程。

Leaves on the line are an expensive problem for the railways.

youdao