balloon tyre

英 [bəˈluːn taɪə(r)] 美 [bəˈluːn taɪər]

n.  低压轮胎(适于在松软或崎岖的路面行驶)

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牛津词典

noun

  1. 低压轮胎(适于在松软或崎岖的路面行驶)
    a large tyre containing air at low pressure, for travelling on surfaces that are soft or not even