A few months later, he worked hard on a small blackboard chalk, and finally succeeded.

几个月后，他用一块小黑板苦练粉笔字，终于成功。

youdao

A few months later, he worked hard on a small blackboard chalk, and finally succeeded.

几个月后，他用一块小黑板苦练粉笔字，终于成功。

youdao