You really are serious about this, aren't you?

你对这事确实是认真的，是吧？

《柯林斯英汉双解大词典》

He's really serious about Penny and wants to get engaged.

他对彭尼的确是认真的，他想跟她订婚。

《牛津词典》

youdao

The report says malaria could be eliminated if countries are serious about using proven control measures like insecticides and bed nets.

VOA: special.2010.11.23

However, if you do happen to be an English or a literature major or someone who's just very serious about reading at that level, you will find plenty to chew on here.

然而，如果你刚好主修英语或是文学,或是任何以主修的水平很认真阅读的人，你将会在这里发现很多值得咀嚼的东西。

耶鲁公开课 - 1945年后的美国小说课程节选

I think most people are quite serious about their studies.

我想绝大多数人都非常重视他们的学业。

图书馆经常人很多 - SpeakingMax英语口语达人

They have IQs that can boil water and are quite serious about their work.

FORBES: Dunce Glut

If we are serious about creating jobs, we need to rethink the problem from the start.

FORBES: How to Create Jobs

She became serious about getting healthy after an asthma attack in 2005, a year after Sarah's birth.

CNN: Family loses 300 pounds together