The oral cavity. The process of digestion begins in the mouth, also called the buccal cavity, which is the opening through which food enters the body.

口腔。消化过程是从口开始的，也可以说是从口腔开始，口腔是食物进入体内的开口。

The shark slowly approaches their prey, and,   when they're close enough, they open their large buccal cavity and create a suction effect  to suck them up.

鲨鱼慢慢地接近猎物，当它们足够近时，它们会张开大的口腔并产生吸力效应将猎物吸起来。