主线 Traditional form: 主線 Pinyin (reading): zhǔxiàn Definitions: main line (of communication) main thread (of a plotline or concept) central theme Characters: 主 - to own; to host; master; host; lord 线 - line, thread, wire; clue, trail Traditional characters: 主 - to own; to host; master; host; lord 線 - line, thread, wire; clue, trail