真空管路介绍：
应用于汽车制动系统，连接发动机进气系统与真空助力器，通过单向阀的开启和关闭，将来自于进气系统的负压传递至真空助力器，提高制动力，同时对发动机各工况负压调节。
Vacuum hose：
It is applied in automotive brake system，connects to engine's air intake system and vacuum power steering, via check valve's opening and close to transfer the negative pressure from intake system to vacuum power steering in order to enhance the brake force and regulate the negative pressure to the engine.
