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BMX

noun
🔊/ˌbiː em ˈeks/
🔊/ˌbiː em ˈeks/
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  1. [countable] a strong bicycle which can be used for riding on rough ground小轮车；越野自行车Topics Sports: other sportsc1
  2. (also BMXing)
     [uncountable] the sport of racing BMX bicycles on rough ground小轮车越野赛Topics Sports: other sportsc1
    3. Word Origin1970s: from the initial letters of bicycle motocross, with X standing for cross.