hollows圆角面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 rivet空心铆钉hollow beams空心光束hollow pulse芤脉hollow nerve凹脸hollow course空心课程hollow sleeve空心套管hollow-axle空心车轴hollow spacer空心十字撑hollowing out中空论hollow sphere空心球