1、n.岩石; 石山; 礁石; 巨石块; 岩块;v.(使)轻轻摇晃，缓缓摆动; 惊吓; 使震惊; 使害怕; (使)剧烈摇摆，猛烈晃动。

2、[例句]These rocks have been dated radiometrically at two billion years old.经辐射能探测，这些岩石形成于20亿年前。