他们需要花钱在电脑屏幕上的三扇门后寻找钱币（你也可以免费玩这个游戏，游戏网址是tierneylab.blogs.nytimes.com）。
They played a computer game that paid real cash to look for money behind three doors on the screen. (You can play it yourself, without pay, at tierneylab.blogs.nytimes.com.)
假如你现在正在参加游戏节目，这里有三扇门，其中一扇门后是奖品，另外两扇门后是煤，主持人知道那扇门后藏着奖品。
You are on a game show. There are three doors. Behind one of them is a prize; the other two have coal. The host knows which door holds the prize.
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