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 UID219516 帖子656 积分5238 学分7135 个 金币34 个 性别男 在线时间193 小时 
     
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                 A tourist was visiting New Mexico and was amazed at the dinosaur(恐龙) bones lying about. How old are these bones? the tourist asked an elderly Native American, who served as a guide.
 Exactly one hundred million and three years old.
 How can you be so sure? inquired the tourist.
 Well, replied the guide, a geologist(地质学家) came by here and told me these bones were one hundred million years old, and that was exactly three years ago.
 
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