短语词组短语tread -wear life 胎面磨损寿命TWI tread wear indicator 轮胎花纹胎面磨损指示器tread wear life 磨耗性能tread wear per mile 每英里tread wear indicato 胎面磨耗标志tread wear grade 胎面磨损级long tread wear 胎面经久耐磨tread wear testing 胎面磨耗试验 返回 tread wear