单词	始原
释义	同BEGINNING
随便看	mainlined main line disconnect switch main line guide pipe main line hanger main line (hydraulic) main line(hydraulic) main line[hydraulic] main line load main-line meter main line (of railway) main line of resistance main line of resistance {= mlr} main line of resistance防御主阵地前沿 main line of turnout main line (pneumatic) main line(pneumatic) main line[pneumatic] mainline program mainliner main lines mainlines mainline section main line shaft main line； revenue track mainlining