David was the eldest of three boys.

大卫是3个男孩中年龄最大的一个。

《柯林斯英汉双解大词典》

We have four girls and three boys.

我们有四个女生，三个男生。

youdao

Some of the girls sang for Ms. Li, and three boys showed their Gongfu talent.

一些女孩为李老师唱歌，三个男孩展示了他们的功夫天赋。

youdao

It shows three boys and a man in a small sailboat.

VOA: special.2010.07.25

Now we're going to hear Beach Boys, IV I guess,with a three-chord chord progression and it's going to be sub-dominant , V dominant , I tonic .

而现在我们来听听貌似是沙滩男孩，三和弦进行，然后将会是次属音，属音，和主音。

耶鲁公开课 - 聆听音乐课程节选

Okay.So that's an example of a classical composer, admittedly in a pretty straightforward situation, using the same three-chord chord progressions we find in the Beach Boys.

好，以上我们举了一个古典作曲家的例子，诚然这个选段的结构比较简单，直接了当，它所用的包含三个和弦的和弦进程与我们在Beach，Boys音乐中分析的相同。

耶鲁公开课 - 聆听音乐课程节选

They narrowed their search to three boys and in few days said they had located Emmanuel.

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In a domestic-science class, three boys are making a presentation for a new washing-powder advertisement.

ECONOMIST: Japan

David Kidder is a serial entrepreneur, an author and the father of three boys.

WSJ: Run Your Family Like a Business