当下做广告之前有一个重要的前提就是大量的日常消费品供给，也就是可卖的东西。
Now there's an important precondition that must exist before you have advertising, and that's a large supply of consumer goods, that is, things to sell.
不论这种价值极高的邮票卖多少钱、买多少钱，没有一个所有者的兴奋可与罗比在1918年发现最幸运的美国邮票那天的兴奋相比！
Yet no matter how much this valuable stamp is bought and sold, no owner can match the thrill that W.T.Robey had on that day in 1918 when he made America's luckiest stamp find!
在非洲，大部分软饮料装在可退的玻璃瓶里卖。
In Africa, most soft drinks are sold in returnable glass bottles.
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