
排水管道
To prevent water damage, the valve must be properly connected to a discharge line which terminates at an adequate drain. 為了防止水的破壞,這些閥門必須與排水管道連接,以便能夠?qū)⑺诺竭m當(dāng)?shù)呐潘凇?!--www.www.sigorfond.com 中小學(xué)英語(yǔ)網(wǎng)-->
Drains which pass under a house must be of cast iron, the most expsive material for pipe drains. 穿過(guò)房屋下面的排水管道,必須使用鑄鐵管,這是排水管所用的最昂貴的材料。