Don't you want to know why they are so successful?

你难道不想知道他们为什么这么成功吗？

youdao

"Why do you want to know that?" he demanded.—"Just curious, that's all."

“你为什么想了解它？”他索问道。—“只是好奇，仅此而已。”

《柯林斯英汉双解大词典》

Do you want to know how I feel about you？

你想知道我对你的感觉吗？

youdao

"People can look at things and be curious about them, but if you are an explorer you want to know why and how and maybe develop an experiment to test the hypothesis."

VOA: standard.2010.06.21

If you're really into it and you're at MIT, maybe you want to know the wavelength of these average fastballs. So, let's go ahead and look at that.

如果你真的深入到这个问题中去,而且你在麻省理工学院，也许你会想知道这些快球的波长,所以我们继续来看这个问题。

麻省理工公开课 - 化学原理课程节选

and making it clear that you want to know what they believe, what their opinion is

清楚地表明你想知道他们想什么，他们怎么看，

怎么协调意见冲突 - SpeakingMax英语口语达人

"You want to know the size of it, look at Pemex's reserves, not BP's, " he says.

FORBES: Going deep

You want to know, it's very important, how the child is progressing prior to that immunization.

NPR: Pediatrician: What Parents Should Know About Autism

If you want to know where high tech is going, never ask the current winners.

FORBES: President-Elect Fails To Understand Tech