短語詞組短語balance lifting beam 天平balance e beam 平衡木balance e beam engine pump 發(fā)動機平衡桿泵Non -automatic balance - Beam balance 非自動天平Balance Beam Score 平衡木評分法Balance beam spherule 平衡木小球Balance beam pumping unit 游梁式抽油機woman balance beam 女子平衡木balance beam system 平衡梁系統(tǒng) 返回 balance beam