Think of standing something next to a grown person to see how big it is. The person is the ruler — and once a person is your ruler, you can measure how big a thing is, how much food is enough, and how hard a job feels.
可以想成把一樣東西搬到一個成年人旁邊比一比，看它有多大。人就是那把尺。而一旦拿人當尺，就不只能量東西多大，還能量一份餐夠不夠多、一件事有多吃力。
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