Each plate of food was weighed before it went out to a customer and when it came back to calculate how much food was left over.
每个盘子的食物在正式端上桌之前都被称了重量，在客人用餐完毕后，盘子被端了回来，研究者们又称取了剩下食物的重量。
Each plate of food was weighed before it went out to a customer and when it came back to calculate how much food was left over.
每个盘子的食物在正式端上桌之前都被称了重量，在客人用餐完毕后，盘子被端了回来，研究者们又称取了剩下食物的重量。
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