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Google and Amazon were quick to put drones to use delivering orders. 谷歌和亚马逊已经开始用无人机送货，反应神速。 But new research suggests delivery is just one small way drones are going to replace humans. The tiny airborne vessels will soon clean windows on skyscrapers, verify insurance claims and spray pesticide on crops. 但最新调查显示，快递运输只是无人机将要取代人类工作的领域之一。看似瘦小的无人机很快就可以给高楼擦玻璃；核实保险索赔，还可能给农作物施肥。 The global market for drones, valued at around $2 billion today, will replace up to $127 billion worth of business services and human labour over the next four years, according to a new research by consulting firm PwC. 普华永道咨询公司最新发布调查报告预计，无人机的全球市场价值如今已接近20亿美元，到2020年，无人机将取代价值高达1270亿美元（约合8271亿元人民币）的商业服务和人工劳务工作。 | 
