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<正>主题语境：人与社会篇幅：339词建议用时：7分钟1 A US company, Mighty Buildings, can 3D-print a house and stick it in your backyard for just ￡75,000. Mighty Buildings uses a 20ft-high printer stored in a California warehouse to make you a small cottage(小屋)and ships it to your property on a truck.
