The baby will open its mouth twice, the second time with a nice wide mouth, and lean in to grasp the breast.

VOA: special.2010.08.04

You have to stop eating with your mouth open.

你不能再边说话边吃饭了。

have to 实战 - SpeakingMax英语口语达人

As the fierce winds charged her belly, Her body was distended and her mouth was wide open.

这时邪风充满了她的肚子，她的身体膨胀起来，她的嘴长得很大。

耶鲁公开课 - 旧约导论课程节选

I'm not going to open my mouth.

我肯定不会泄露一个字。

That's all实战 - SpeakingMax英语口语达人