英文翻译: 在不进行冷却的情况下，牛奶在24小时之内就会变质。这正是送奶工存在的原因。他们每天都要

In the case of without cooling, within 24 hours will be spoiled milk. This is the reason for the existence of the milkman. Their distribution of milk every day, until the emergence of the refrigerator In the case of not cooling, the milk will degenerate within 24 hours.. This is the reason for the presence of the milk supply.. They have to milk the milk every day until the appearance of the refrigerator.

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