Many Chinese people will wonder what presents to get for their moms on Mother's Day, but not many know Mother's Day is actually a festival from overseas.

很多中国人都想知道母亲节应该送什么礼物给妈妈，但是没有多少人知道母亲节实际上是一个来自海外的节日。

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If you've been lucky enough to look at a piece of rock art close up, you'll know it's an experience that makes you wonder about the passage of time and our own history.

如果你有幸近距离观看一件岩石艺术品，你会知道这是一种让你对时间流逝和历史感到好奇的经历。

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When I look at my friendship with Joe, I wonder how many people I've known whom I never disliked but simply didn't take the time to get to know.

当我想到我和乔的友谊时，我就会思考，我认识的人中有多少个我不讨厌，但只是没有花时间去了解的人。

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You know, I kind of wonder, the list of countries that I just read to you, that Dimson,Marsh and Staunton studied, excludes some important countries, doesn't it?

我这里有些疑惑,刚刚我所读过的名单上的国家,那些蒂姆森,马什和斯汤顿研究过的国家,并不包括一些重要的国家,不是吗

耶鲁公开课 - 金融市场课程节选

The "I wonder if" pattern, like it sounds, is used to express the fact that you don't completely know something.

I wonder if”句型，就像字面意思表达的一样，是用来表达你对某事并没有彻底的了解。

I wonder if 课堂 - SpeakingMax英语口语达人

So, you really have to wonder just, you know.

所以你就会想为什么。

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Ms. MARINO: I can't begin to tell you, you know, how it feels to constantly wonder, you know, is my husband coming home, you know, are my kids going to have a dad or, you know, is he going to come home OK. And, you know, they always come home different.

NPR: A Military Wife on Bush Plan for Troop Increase

No wonder people wanted to know how this new world would differ from the old one.

ECONOMIST: A survey of geopolitics

Similarly, readers not enamoured of jazz may wonder why they need to know so much about Dave Brubeck.

ECONOMIST: The California dream