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 乾線鉄路electric main connection line 電氣主接線Main Production Line 主要産品;主生産線main lighting line 照明乾線main suspension line 主懸索 返回 main line