notches in cartilage of external acoustic meatus

例句：

1. 1. The car'sbumper has several notches for parking.
   这辆车的保险杠有几个用于停车的齿状物。
2. 2. The old tree haddeep notches in its bark.
   那棵老树的树皮上有深深的齿状物。
3. 3. The hunter found a notchin the rock that led to a hiddencave.
   猎人在岩石中发现了一个齿状物，通向一个隐藏的洞穴。