这种物质一般从小牛的胃中采集而来，里面含有的多种酶能够切断牛奶中的一种蛋白——酪蛋白的水溶性末端。

Then they add a substance usually harvested from veal stomachs called rennet, a mixture of enzymes that slice the ends off caseins, a kind of milk protein.

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它打碎了蛋白的长分子链，使得它们更容易被胃酶消化。

It breaks up the long protein chains, and that makes them easier for stomach enzymes to digest.

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你吞下的食物会穿过食道进入胃里，胃里的各种酶和酸会分解食物，开始消化的过程。

When you swallow food, it travels down your esophagus into your stomach. Here enzymes and acids go to work on the food, beginning the process of breaking the food down.

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