It may mean feeling interested in something and studying hard.

它可能是指对某件事情感到兴趣并且努力研究。

youdao

Working and studying hard are very important for us. But having a healthy body is more important.

努力学习努力工作对于我们来说很重要，但是拥有一个健康的身体更重要。

youdao

I persuade him into studying hard so that he can realize his dreams and live a better life.

我劝说他努力学习，这样他才能实现梦想，过上更好的生活。

youdao

He would try to explain it this way when students asked for a top grade just for studying hard in chemistry class: What if a baseball player came to spring training and worked harder than all the others, but still could not play well.

VOA: special.2009.03.12

Aby wants to pursue a career in medicine, and is studying hard in school.

FORBES: Thoughts from Aby on Her Thirteenth Birthday

Six months on, Mr Chen is studying hard and may be well rested, but he cannot be happy with the situation back in China.

BBC: Faces of the year: The men

All three are studying hard and starting to think about college.

NPR: Immigrant Students Talk About U.S. Life