He was breathing through his open mouth.

他张着嘴呼吸。

《牛津词典》

He pushed the barrel of the gun into the other man's open mouth.

他把枪管插入另一个人张开着的嘴里。

《柯林斯英汉双解大词典》

They climbed up the throat of the monster till they came to that immense open mouth.

他们顺着怪物的喉咙往上爬，一直爬到那张开着的大嘴跟前。

youdao

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

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

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

The very first thing we see, for example, is an open mouth, belonging to a man under interrogation.

NEWYORKER: Better Times

After the dead bear arrives for mounting, taxidermists hit customers with a key question: open mouth or closed mouth.

WSJ: After Long Hibernation, Taxidermists Make a Killing During Bear Season

"The human head had a light brown colour, open mouth and partially closed eyes, " said the scientists, led by forensic pathologist Philippe Charlier.

BBC: Tests show head of France's King Henri IV 'genuine'