treadn.步法；踏面；胎面花纹；鞋底v.踩；行走；践踏；(鸟类)交配tread long步长tread downv.踏平；抑制tread shoe[机] 履带板tread withv.与 ... 交尾tread roll轮箍踏动滚动tread depth花纹深度,胎面花纹深度tread miles轮胎磨损前的行驶英里数tread fault踏面故障treadlemilln.脚踏传动式试验台tread power踏踩动力