https://dictionary.cambridge.org/zht/%E8%A9%9E%E5%85%B8/%E6%BC%A2%E8%AA%9E-%E7%B9%81%E9%AB%94-%E8%8B%B1%E8%AA%9E/%E6%98%8E%E6%98%9F
一線明星 ... one of the most famous of all famous people: He's not yet an A-lister, but his popularity is growing. 他還不是一線明星,但他的人氣正在增長。