保桿是用來吸收低速撞擊的力道，用意在於減少車體損傷 (注意，是減少車體損傷，不是用來保護人命的)
The car bumper is designed to prevent or reduce physical damage to the front and rear ends of passenger motor vehicles in low-speed collisions.
It is not a safety feature intended to prevent or mitigate injury severity to occupants in the passenger cars.
