As air pushes through, it forces them open and then they snap close.

当空气通过时，它迫使它们打开，然后它们会合上。

As he turns, the jaws of the Albertosaurus snap closed on the side of his frill, and broken teeth fly into the air.

它转身之时，阿尔伯特龙的双颌咬住了它褶皱的侧面，碎裂的牙齿飞向了空中。

They create little negative pressure  vacuums inside their traps, which, when triggered by prey, pop open and suck  the victim inside before snapping closed.

它们在陷阱内几乎不产生负压真空，当被猎物触发时， 陷阱会突然打开并将受害者吸进去， 然后突然关闭。