For example, both mechanical and chemical digestion start in the mouth, and continue through the stomach and small intestines.

例如，机械和化学消化都从口腔开始，并继续通过胃和小肠。

Here, in an amazing display of mechanical and chemical digestion, food gets broken down into its smallest elements, like iron, the building block of hemoglobin.

在这里，在机械和化学消化的惊人展示中，食物被分解成最小的元素，如铁，血红蛋白的组成部分。

The small intestine (small bowel) is the region of the gut where nearly all of the chemical digestion of the nutritional components of food takes place.

小肠（小肠）位于肠区，几乎所有食物的营养成分的化学消化都在肠道区域进行。

The goal of all this pulverization is to increase the surface area of that bite of food by breaking it down into increasingly tiny pieces, to prepare it to encounter more enzymes in step four: chemical digestion.

所有这些粉碎的目标是通过将食物分解成越来越小的碎片来增加食物的表面积，为它在第四步遇到更多的酶做好准备：化学消化。

If you were able to keep down your lunch today, you learned how mechanical and chemical digestion start in the mouth and continue in the stomach, where food is pummeled by acids and enzymes and turned into chyme.

如果你今天能不把午餐吐出来，那你就学会了机械和化学消化是如何从嘴里开始并在胃里继续的，食物被酸和酶击打并变成食糜。

Next, the food travels down through the esophagus to the stomach, where mechanical and chemical digestion continues, the muscular walls of the stomach contract vigorously to mix food with gastric juice, producing a mixture called chyme.

液化食物逐渐进入小肠，在十二指肠（小肠的第一部分）中，接受来自胰腺的酶。