Three lines
Three lines for the three occupation collectively, the ancient Chinese construction industry is divided into the shelves - from top to bottom, that is, the construction industry; off the shelf - from the bottom up, that is, the shipbuilding industry; in the frame - Industry, construction of bridges, wheels and cars; other including military - bow, arrows, chariot, and even torture; agriculture - Jia Jia equipment; and furniture and daily necessities. Construction of wood as the main raw material, so in the wood production, design and technology, the need to continue to improve, Qiaohuo carpenter more construction industry an integral part. As a result of the changing times, modern changes in the use of carpentry, mud (using cement) and paint (one said shed) three renovation works in the inevitable part of the work together known as the three lines. ...