放水孔 meaning in English
condensate drain orifice
dewatering orifice
outlet hole
relief hole
water drain hole
Examples
- Application for penetration of gas hole , water - discharging hole and grout hole under coal mine
适用于煤矿瓦斯抽放孔放水孔注浆孔的钻进。
condensate drain orifice
dewatering orifice
outlet hole
relief hole
water drain hole