A tourist was visiting New Mexico and was amazed at the dinosaur¹（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 geologist²（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.

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。