乌云是雨或雪将至的预兆。 Dark clouds are a sign of rain or snow.
预言者古罗马的预言者，尤指解释来自对鸟类的观察而得到的预兆的人 An augur of ancient Rome, especially one who interpreted omens derived from the observation of birds.
（古罗马）占卜官古罗马宗教官员的一员，可通过观察并解释某些信号及预兆来预言事情 One of a group of ancient Roman religious officials who foretold events by observing and interpreting signs and omens.
