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来源:雅诚德英语网
We are seated in one of the trains, and with us we have a special speedometer that measures their relative speed.
我们坐在其中的一列火车上带着特制的速度测量仪,可以测出两列火车之间的相对速度。
We are seated in one of the trains, and with us we have a special speedometer that measures their relative speed.
我们坐在其中的一列火车上带着特制的速度测量仪,可以测出两列火车之间的相对速度。