tready条约treadn.步法；踏面；胎面花纹；鞋底v.踩；行走；践踏；(鸟类)交配tread contact width轮胎接地宽度tread on sb's cornstread on one's heelstreadle rail contact轨道接触器,踏板tread on one's cornstread systems design行走机构设计tread pattern groove胎面花凹纹tread on the neck ofvt.骑在 ... 头上(压迫； 虐待)tread a line between行为小心谨慎； 以免犯错; 走着 ... 道路; 采取 ... 行动; 用独特的方法做事tread mill ergometer活动地板功量计