短語詞組短語main breadth line 舯部最大寬度;船舶最大寬度線main spectral line 主譜線;主軸main telephone line 電話主線main -line railway 干線鐵路electric main connection line 電氣主接線Main Production Line 主要產(chǎn)品;主生產(chǎn)線main lighting line 照明干線main suspension line 主懸索 返回 main line