When the food is swallowed, it goes into a kind of little mill called the " gizzard. "

食物咽下去之后, 会进入一个小小的加工厂, 名叫" 砂囊" （gizzard）。

The gizzard is a strong bag. It is nearly full of stones and gravel which the fowl has swallowed.

砂囊是一个强壮的肌肉构成的袋子, 里面几乎盛满了鸡吞下去的石头和沙砾。

That's meat. That's mince is it? You're not grinding up gizzards for us are you?

那是肉。 那是肉末吗？ 你不会给我们磨砂浆吧？

Some birds have VERY strong gizzards that can even break down small pieces of steel!

有些鸟的砂囊非常坚固， 甚至可以分解小块钢铁！

And fossils also revealed that birds started to have fewer teeth after they developed gizzards.

化石还显示，鸟类 在长出砂囊后牙齿开始减少。

He thought plainly that the gizzard had not been removed.

他明明白白地认为砂囊没有被去除。

And like the word gizzard they're also pretty fun to say.

就像 gizzard 这个词一样，他们说起来也很有趣。

She gave peope ginger, ginseng, gizzard and gland.

她给人们姜、人参、禽鸟的肫和坚果。

Yeah it didn't taste bad. The taste was fine, it was just the idea of eating a gizzard.

是的，味道不错。味道还行，就是吃个肫的意念。

So with the advent of gizzards at least 120 million years ago, the need for teeth started to fade.

因此，随着至少 1.2 亿年前砂囊的出现，对牙齿的需求开始减弱。