hard heading

例句：

1. 1. The car had a hard head and wouldn't start.
   这辆车有硬头，发动不了。
2. 2.The new model has a hard head that protects the screen from scratches.
   新款模型有一个硬头，可以保护屏幕免受刮擦。
3. 3. The hard head on the door prevents it from being opened too easily.
   门上的硬头防止它被轻易打开。