你的胃每隔几天就会换一层新的内壁

Your stomach gets a new lining every few days.

That sounds strange, but it's true. Your stomach has a very strong acid inside it. That acid helps break down the food you eat. But if that acid touched your skin, it would burn you.

So why doesn't your stomach burn itself? Because your stomach grows a new layer of mucus and cells every three to four days. It's like giving your stomach a fresh coat of paint all the time.

That means your stomach is always renewing itself. Pretty smart, right?

So next time your stomach growls, just remember — it's working hard and staying fresh.

你的胃每隔几天就会换一层新的内壁。

听起来有点奇怪，但这是真的。你的胃里面有很强的胃酸，这种酸帮助你消化吃下去的食物。但如果这种酸碰到你的皮肤，会烧伤你。

那为什么胃不会把自己烧掉呢？因为你的胃每隔三到四天就会长出一层新的黏液和细胞。这就像一直在给你的胃刷上一层新漆。

也就是说，你的胃一直在自我更新。很聪明吧？

所以下次你肚子咕咕叫的时候，只要记住——它正在努力工作，并保持新鲜。