精品文档---下载后可任意编辑Unit 1 The Evolution of Transport 交通工具的演化The evolution of transport has been closely linked to the development of humankind throughout the earth’s history ． Transport’s early function was to meet the basic need of hauling food supplies and building materials ． But with the formation of tribes ， then peoples ， and finally nations，the societal and economic functions of transport became more and more complex. At first there was mobility required for individuals，clans，households，and animals to protect them against，and to escape from，the dangers of natural disasters and tribal aggressions，and in the search for the best places to settle．As tribal groups formed and gradually established their geographical identity，transport was increasingly needed to open up regions for development，to provide access to natural resources，to promote intercommunal trade，and to mobilize territorial defense．When the first nations came into being，transport played a major role in establishing national integrity．交通工具的演变紧密相连的人类在整个地球的历史进展。运输署早期功能是满足基本需要搬运粮食供应和建材等领域。但随着部落，然后人民，和最后国家形成，运输的社会和经济功能变得越来越复杂。在第一次有流动性所需的个人、 宗族、 家庭和动物保护他们免遭，和躲避危险自然灾害和部落的侵略行为，并在寻找最好的地方定居。部落群体形成和逐步确立其地理特征，运输日益需要开放地区的进展，以提供对天然资源，促进族裔间的贸易，并调动本土防卫的访问。当第一次的联合国应运而生时，运输发挥了重要的作用，建立民族气节After basic societal needs had generally been attended to ， local communities could increasingly devote their efforts to enhancing their economic，cultural，and technological development through trade links with 精品文档---下载后可任意编辑other peoples and regions．Again，transport provided...
