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自古以来,人们就希望道路平坦、笔直。然而,现今的高速公路却并非一般人所想象的那样。因为在过于平坦的路面上高速行驶,发动机的声调一成不变,
Since ancient times, people wanted the road to be flat and straight. However, today’s freeways are not what most people think. Because of the high speed on an overly flat road, the tone of the engine remains unchanged,