treadn.步法；踏面；胎面花纹；鞋底v.踩；行走；践踏；(鸟类)交配Tread softly.脚步放轻些。treaded by acid酸处理Treadwear Grade胎面磨损级tread thickness胎冠厚度,胎面厚度tread mils test跑台试验treadle-pressn.脚踏印刷机tread concavity胎面压扁tread a path.踩出一条路treadway bridge双车道浮桥tread the stagevi.上舞台(当演员)