短語詞組短語main -stem type 主莖型main valve stem [機(jī)]主閥桿main valve stem nut 主閥桿螺母main piston stem 主活塞桿right main -stem bronchus 右主支氣琯computer main -stem network 計(jì)算機(jī)骨乾網(wǎng)Main Stem Magnifier 乾線放大器common main stem road 普通乾線公路main stem superiority 主莖優(yōu)勢(shì) 返回 main stem