凝固的意义

solid-fuel heating───固体燃料加热

cognitive meaning───认知意义

hidden meaning───隐含意义

cognitive meanings───认知意义

convey meaning───传达意义

deep meaning───深层意义

double meaning───双重意义，双关

Also, because the second moon would have been smaller than the main one, it would have cooled and solidified more quickly, meaning that its rocks would be older.───而且，因为第二个月亮(月状物)比主月小，那么它可能冷却和凝聚地更快，这意味着它的岩石会更古老。