很容易得见，交易能够使他们享受到更多的选择：他们都可以吃到夹着法式煎土豆的汉堡牛排。
It is easy to see that trade would allow them to enjoy greater variety: Each could then have a hamburger with French fries.
很容易得见，交易能够使他们享受到更多的选择：他们都可以吃到夹着法式煎土豆的汉堡牛排。
It is easy to see that trade would allow them to enjoy greater variety: Each could then have a hamburger with French fries.
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