在英语中，男孩的嘴可以用 "mouth" 来表示。这个词来自古英语 "mōþ"，最早记载于约公元 725 年的《诗篇》中。

下面是一些英文例句及其中文翻译：

The boy opened his mouth to say something, but no sound came out. (男孩张开嘴想说什么，但是没有声音出来。)

She put her finger to her pps and told the boy to keep his mouth shut. (她把手指放在嘴唇上，告诉男孩闭上嘴。)

The boy had a dirty mouth and often used bad language. (这个男孩嘴很不干净，经常说脏话。)

The boy's mouth was watering at the sight of the depcious food. (看到这道美味的食物，男孩的嘴开始流口水了。)