BMX

例句：

1. 1. The BMX racers are competing in the national championships.
   BMX赛车手正在参加全国锦标赛。
2. 2. I used to ride my BMX around the park when I was a kid.
   我小时候经常骑着我的BMX在公园里转。
3. 3. The BMX track is a popular spot for local teenagers to hang out and have fun.
   BMX赛道是当地青少年喜欢去的地方，可以玩乐。