Many carnivorous dinosaurs have ambiguous features, such as "peg-like" teeth at the front of the mouth, or no teeth at all.

许多食肉恐龙的特征并不是很明显，例如，要么在嘴的前部有“钉状牙齿”，要么就根本没有牙齿。

youdao

This strange animal of Australia has a mouth similar to the bill of the duck. Its bill is soft and it has no teeth in the mouth.

澳大利亚的这种奇怪的动物的嘴巴像鸭嘴，而且它的嘴巴是软的，嘴里也没有牙齿。

youdao

We grow out of having short bandy legs and no teeth. We would also grow out of having a naked skin if it proved to be a disadvantage.

我们出生时都是四肢短小、没有牙齿，如果没有毛发是个缺点的话，那么我们出生时也会如此。

youdao

It is independent, but has no teeth of its own.

ECONOMIST: A very British sleazebuster

But a survey carried out in 1998 showed that only 13% of adults had no natural teeth - and over half those of pensionable age retained at least some of their natural teeth.

BBC: Dentists warn over ageing teeth

In 1968 over one third of the total adult population of the UK had no natural teeth, and only a small number of people of pensionable age had any teeth at all.

BBC: Dentists warn over ageing teeth