在当今世界,常听得议论“人类将重新回到洞穴里去生活。”初听不免使人愕然,深有“天方夜谈”之感。但这又确是事实。随着生产的发展,文明的进步,人类早已告别了过去赖以生活的天然洞穴,聚居于原始的村落。接着,他们又告别了包围于绿色世界中的村落,在平地上造起了一座座城镇,开始了新的文化生活。随着工业化步伐的加速,人类的生活发生了翻天覆地的变化:城市的规模在膨胀,工厂林立,摩天大楼拔地而起,高架道路纵横交错,电气机车,高速汽车和超音速飞机,在 In today’s world, it is often heard that “Humanity will return to life in caves.” “First-time listening can not help but make people feel lost, and there is a sense of ”Tianfang night talk." But this is indeed true. With the development of production and the advancement of civilization, mankind has long since bid farewell to the natural caves that used to live in the past and has settled in primitive villages. Then they bid farewell to the villages encircled in the green world, built a town on the plains, and began a new cultural life. With the accelerating pace of industrialization, human life has undergone earth-shaking changes: the scale of the city is expanding, the factories are everywhere, the skyscrapers are rising, the elevated roads crisscross, electric locomotives, high-speed cars and supersonic aircraft.