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如果你拥有一张美钞,不妨细心观察一下上面的华盛顿肖像,你就会发觉,这位美国总统的嘴巴,永远都是紧闭着!原来满口假牙
If you have a dollar bill, you may wish to take a closer look at the portrait of Washington, you will find that the mouth of the President of the United States will always be closed!