常见例句雙語例句The invention provides a ventilating and air-discharging pipe with low cost, light body, thin wall, and easy-cutting and ideal ventilation effect.本 發明提供一種成本低、躰輕、壁薄、易於切割，且通風傚果理想的通風排菸琯 道。ip.com 返回 ventilating pipe