When it comes to study, he is very serious.

一涉及到学习，他就非常认真。

youdao

He is very serious about his work and he's more experienced in the ways of the world.

他是一个很认真对待工作的人也是我们之中对这个世界比较有经验的。

youdao

AT first I didn't think I would go to his party because he is very serious in normal times.

起初我觉得我不会去参加他的聚会，因为他平时很严肃。

youdao

And he demonstrated by appointing the Vice President to lead these talks that he is very serious about leading this process to a conclusion that produces serious deficit reduction.

WHITEHOUSE: Press Briefing

He is voicing a very serious concern "that Malays are not competitive enough both in the local and global market place, " says economist Charles Santiago.

CNN: The New Malay Dilemma

"It really is very serious, " he says.

FORBES: Open-Source Drug Safety?