protrusive relation

例句：

1. 1.The protrusive rock is a good place to climb.
   突出的岩石是很好的攀爬地点。
2. 2.The protrusive part of the machine is the motor.
   机器的突出部分是电机。
3. 3. The protrusive horns of the bull are used for fighting.
   公牛的突起角用于战斗。