people often assume that cows produce milk just because they are cows and that producing milk is what they do as if it were their job but cows produce milk only in order to feed a calf they have to be made pregnant every year so that they keep producing milk this results in a lot of calves as a side-effect of milk production
人们通常认为奶牛产奶只是因为它们是奶牛，产奶是它们的工作，就好像这是它们的工作一样，但奶牛产奶只是为了喂养小牛，它们必须每年怀孕，这样它们才能不断产奶，这导致了很多小牛作为产奶的副作用
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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