Professor george w . wetherill of the university of california in los angeles says that he would give the first two theories each a 10 percent chance and the third theory a 20 percent chance 洛杉磯加州大學(xué)的喬治教授說,他認為前兩個理論有百分之十的正確性,第三個理論有百分之二十的正確性,另外的百分之六十他將給“至今我們都還沒想到的事物” 。