凝乳牛奶的一部分，在牛奶发酵或用酶进行处理时凝结。

The part of milk that coagulates when the milk sours or is treated with enzymes. Curd is used to make cheese.

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一头乳牛能提供一家人所需的牛奶。

One cow provides enough milk for a family.

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随着冬季的来临，牧草生长停滞，乳牛产奶的需求也相应减少了，因为小牛现在已经长大了，不再需要牛奶哺育了。

With the advent of winter, pasture growth arrest, cow milk is also a corresponding reduction in demand, because the calf has now grown up, no longer need milk nurtured.

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