Gas tightness and water tightness ensure Goldcommon door and window system to produce healthy and comfortable living conditions.
柯曼门窗系统创造健康、舒适的居住环境，离不开优良的气密性和水密性。
2
Adopting the quick pipe connector to improve systemtightness. After being parked for some time, the vehicle can be started without stoping for charging, thus realizing the fuel economy.
采用快插接头，改善系统密封性，停放一段时间后，不需停车充气即可起步，节省油料；
3
The paper holds whole-length tightness in case study, namely, system and the consecution of this part accords with the former part.