I spend all my working hour dealing with construction. This picture I took today at jobsite is a good example. Nomally people only see sink and fixture, but I see drain and vent. The copper pipe in the picture are vents, they play an important part in plumbing system.
水管線路是我天天要接觸的工作，這是我今天在工地拍的照片，圖中的銅管是排氣管，它在建築的線路中，佔有很重要的地位，如果設計中沒有它，房子裹會充滿臭氣，還會造成水流不通喔！