A tourist was visiting New Mexico and was amazed at the dinosaur 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 came by here and told me these bones were one hundred million years old, and that was exactly three years ago.一位游客在新墨西哥游览。他对随处可见的恐龙化石甚感惊奇。“这些化石有多长的历史？”游客问一个上了年纪的当地美国人。他是作向导的。“整整十亿零三年了。” “你怎么这么肯定？”游客问道。 “哦，”向导回答道，“一个地质学家来过这儿，他告诉我说这些化石有十亿年了，再加上那是整整三年前的事了。”