I have a number of teeth with me here from several different groups of dinosaurs.

我这里有几颗来自不同恐龙群的牙齿。

According to some anthropological evidence, this also meant that our jaws shrank, but the number of teeth we had stayed the same, leading to the orthodontic woes of today.

根据一些人类学证据， 这也意味着我们的下巴缩小了，但我们的牙齿数量保持不变， 导致了今天的牙齿矫正困境。

Every goat that we receive is then recorded, as its unique ID — its key characteristics such as its sex, its age, its weight and even its number of teeth are taken into account.

我们收到每只山羊都会做记录，记录它的唯一标识 ——它的重要信息，比如性别、年龄、体重，甚至还有牙齿数量都会记录下来。

Perhaps the lesser number of teeth in the proportion of four to seven in the upper halves of the two jaws of the plaice, to twenty-five to thirty in the lower halves, may likewise be accounted for by disuse.

。 鲽鱼两颚上半部的牙齿数量较少， 为 4 到 7 颗，而下半部的牙齿数量为 25 到 30 颗， 同样可以用废弃来解释。