大家早已知道,从各种谷类或馬鈴薯可以制得合成橡膠,但是用这种生产方法,就要消耗大量的粮食。最近已經可以利用石油廢气中的丁烯和丁烷来制取丁二烯,还可以用乙烯直接水合的方法来制取合成酒精,这样生产合成橡膠,每年就可以节約出好几百万吨粮食。塑料塑料所制成的成品已經遍布在全世界每个角落里。飞机、潛水艇、輪船、汽車都必須用到它。至于說到拿它做成的食具、收音机壳、电影膠片、手提包、电話、玩具、唱片等等物品,更是多得說不完。木材虽然是輕巧而实用的材料,但是它容易燃燒和 It has long been known that synthetic rubber can be made from various grains or potatoes, but with this method of production, it consumes a lot of food. Recently, butadiene can be made from butenes and butanes in petroleum exhaust gas. Synthetic alcohol can also be produced by direct hydration of ethylene. This way, synthetic rubber can be produced, which can save millions each year. Tons of food. Plastic and plastic finished products have been found in every corner of the world. Aircraft, submarines, ships, cars must use it. As for the food utensils, radio shells, motion picture films, handbags, telephones, toys, records, and other items made with it, there are many more to say. Although wood is a lightweight and practical material, it is easy to burn and