一个天天喝牛奶的人，无论喝的奶有多好，他的身体，永远都比不过天天给他送牛奶的工人。
同样的道理：一个只靠体力天天送牛奶的人，无论多么卖力的干活，他的收入，可能怎么都比不过天天在家里喝奶的客户。
这就是世界的基本定律。社会总在以一种公平的方式来维持它的平衡：它不会把一切最好的都给你，总会给你一些向往。这个向往的过程就叫生活。
Everyone who drinks milk every day, no matter how good the milk he drinks, his body will always be better than the worker who gave him milk every day.
In the same way: A person who only uses milk every day for physical exertion, no matter how hard his work, his income may be more than what he can drink at home.
This is the basic law of the world. The community always maintains its balance in a fair manner: it will not give you everything and always give you some yearning. This longing process is called life.