The mouths of Great Whites contain pointy lower teeth for holding prey and triangular serrated upper teeth for slicing.

还有些是针头一样尖的用来抓鱼大白鲨的下牙低而突出用来捉住猎物。

I had all these rotten teeth, lower teeth, and he would just say show your teeth.

我有所有这些烂牙， 下牙，他只会说露出你的牙齿。

What that tells me is when he grabs you, he uses the muscle in his jaws to push those lower stubby teeth into you.

这就说明当它咬住你时，它用颌部的肌肉来把这些粗短的下面牙齿咬进你身体。

What makes Brygmophyseter such an incredible whale is that it's got both upper and lower teeth, you look in that mouth, there's 44 teeth in there.

让四贺鲸成为如此奇鲸的原因是它上下颌上都有牙齿，你看看那张嘴里面，有44颗牙齿。

For example, the 365 million-year-old tetrapod, Icthyostega, had curved upper teeth, smaller lower teeth, and a flexible neck that probably made it a formidable predator.

例如，距今 3.65 亿年的四足动物 Icthyostega 拥有弯曲的上牙、较小的下牙和灵活的颈部，这可能使它成为一种可怕的捕食者。