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联邦德国最近研制出一种新型轮胎,其特点是不用充气,能安装在一种专门的轮缘上。照片的右侧显示出这种轮胎的横截面。这种轮胎的问世使得司机不
Federal Republic of Germany recently developed a new type of tire, which is characterized by no inflation, can be installed on a special rim. The right side of the photograph shows the cross-section of this tire. The advent of this kind of tire makes the driver not