spike-tooth concave

例句：

1. 1. The car's engine is sprung with a spike-toothed concave.
   这辆车的引擎是带有尖齿凹面的。
2. 2. The rock formation has a spike-toothed concave that looks like a dragon's mouth.
   这个岩石构造有一个尖齿凹面，看起来像龙的嘴巴。
3. 3. The car's suspension system has been modified to accommodate the spike-toothed concave.
   汽车的悬挂系统已经被修改过，以适应尖齿凹面。