努力

In order to improve his Chinese proficiency, he studied hard every day.

As long as you study hard, you can get into a good university.

After three years of hard work, he was finally admitted to Peking University.

This child is not only smart, but also studies very hard.

You usually study so hard, this exam must be no problem.

You usually don't study hard, and it is too late to rely on the days before the exam to make up.