hollowadj.空的；空洞的；凹陷的；虚伪的；(声音)沉闷的n.山谷；洞；窟窿vt.挖空vi.形成空洞adv.完全地；彻底hollow pipe空心管子hollow wall空心墙hollow stay空心撑杆hollow disk空心盘Hollow form中空状hollow CFST离心空心钢管混凝土hollow pier空心桥墩hollow butt根孔hollow mill空心铣刀,筒形外圆铣刀hollow body空心体