"人是会做交易的动物没有其他动物会这样没有狗会与其他狗交换骨头"
— Adam Smith
Simplified Meaning:
People are unique because they have the ability to trade things with each other. While animals might fight or share, they don’t make deals or swaps like humans do. Imagine two friends exchanging toys: one friend has a toy car, and the other has a toy plane. They decide to trade because each wants what the other has. This kind of exchange helps people get what they need or want without using money or fighting. Trading and making deals is a big part of what makes human society work smoothly, helping everyone to benefit. So, when you negotiate or trade something with someone, you are using a special human skill that other animals don’t have.