英语语法分析

The Changchun subway will be in use.

长春地铁将投入使用。

Are many other people in Changchun also making preparations?

长春还有很多人也在做准备吗？

On May 21st, the International Marathon was first held in Changchun.

5月21日，国际马拉松赛首次在长春举行。