常見例句雙語例句The invention provides a ventilating and air-discharging pipe with low cost, light body, thin wall, and easy-cutting and ideal ventilation effect.本 發(fā)明提供一種成本低、體輕、壁薄、易于切割，且通風效果理想的通風排煙管 道。ip.com 返回 ventilating pipe