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 洛杉矶加州大学的乔治教授说，他认为前两个理论有百分之十的正确性，第三个理论有百分之二十的正确性，另外的百分之六十他将给“至今我们都还没想到的事物” 。
