Trapped in a pocket of air, they had only 40 minutes before the tide flooded the chamber.

他们被困在有一点空气的弹丸之地，再过40分钟洪水就会淹没这间屋子了。

《柯林斯英汉双解大词典》

The middle ear is a small pocket of air behind the eardrum.

中耳就是骨膜后面的一个小气袋。

youdao

Sometimes swimmers call this' breathing into the pocket 'as it feels like there's a pocket of air there by your head.

有时游泳的人把它称为“呼吸进口袋”，因为它看起来就象在你头边有一个空气袋。

youdao

At least 23 survivors had been located in one air-pocket of the collapsed building, while two more groups were located close by, bringing the total to as many as 50, says our reporter.

BBC: Dhaka building collapse: 'Large group' found alive

They regularly drop in on Mr Gold, who quizzes them closely, his wild greying locks and well-stuffed shirt pocket giving him the air of a rumpled physics professor expounding an exotic retail calculus.

ECONOMIST: Face value

The bullet, known as the Attenuating Energy Projectile (AEP), has an air pocket inside which disperses the force of the bullet across a wider area.

BBC: NEWS | UK | Police get 'safer' rubber bullets