5 کلمه ای که امروز با آن ها آشنا می شویم به شرح زیر است.
1.تیر طره
2.سیمان
3.ملات سیمان
4.کانال
5.رس
1.CANTILEVER: A beam which is securely supported at one end, and hangs freely at theother; an overhanging beam
2.CEMENT: A mixture of silicates and aluminates of calcium that when mixed with water it binds a stone-sand mixture into a strong concrete within a few day
3.CEMENT MORTAR: Mortar usually composed of four parts sand to one of cement, with asuitable amount of water
4.CHANNEL: A natural or artificial water course
5.CLAY: Very fine-grained soil of colloid size(Finer than 0.002 mm), consisting mainly of hydrated silicate of aluminum. It is a plastic cohesive soil which shrinks on drying,expandson wetting, and gives up water when compressed
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