振动的害处人类生活的世界就是一个振动的王国。城市的地下铁道在振动,公共汽车在振动,工厂里的机床——车、磨、刨、铣、钻等都产生频率不同的振动。振动可以危害人们的健康,被视为现代工业的一大污染。振动一旦超出某一界限,许多疾病就会接踵而来。例 Harmful Vibrations The world in which human beings live is a vibrating kingdom. The metro in the city is vibrating, the bus vibrating, and the machines in the factory - carriages, sharpening, planing, milling, drilling, etc., generate different frequencies of vibration. Vibration can endanger people’s health and is regarded as a major pollution in modern industry. Vibration once beyond a certain threshold, many diseases will come one after another. example