This is unusual as it is thought thatpeople first stumbled across making cheese by carrying milk in bags made ofanimal guts, which contained rennet that curdled the milk.

这非同寻常，因为据认为人们是在偶然的情况下才发明了奶酪：用动物内脏制成的袋子来装运牛奶，而动物内脏含有可凝固牛奶的凝乳酶。 薣。

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Calf rennet is still used by specialty cheese manufacturers.

小牛的凝乳酶素仍然被专业的乳酪生产商所使用。

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There is vegetable rennet available and many organic dairies produce cheese with it instead;

有可用的植物性凝乳酶，许多有机乳制品店做乳酪时用它来代替动物性凝乳酶；

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