求翻译：胎面花纹检查——胎面的花纹至少应该还有1.6mm深。如果不能保证胎面所有位置的花纹都有这么深的话，这些轮胎就应当被换掉了。检查的方法很简单，把一枚1元人民币嵌入花纹当中，如果在硬币的正面能够看到边上的虚线环，则轮胎必须要被替换了。除此以外，发现胎壁有明显的不正常磨损、凸出，抑或轮胎需要频繁定期充气的话，那这条轮胎需要到维修点进行检查。是什么意思？

Check the tread pattern - the tread pattern at least there should be 1.6mm deep. If you can not guarantee that all the location of the tread pattern has such a deep, these tires should be replaced. Inspection method is very simple, put a 1 yuan embedded pattern, if in front of the coin can see the e