But now hollow rubber tyres are fitted on to wheels and the air acts like a soft cushion to help smooth out the bumps in the road.

 
  • 可是現在給輪子按上空心橡膠輪胎,然后打足氣,空氣起著(zhù)柔軟的緩沖器那樣的作用,幫助清除在路上碰到的東西。
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