8、ery charger自行车品种单轮车unicycle电动车 electric bike折叠车folding bike童车children's bike/kids bike运动车exercises滑板车 scooter山地车MT/mountain bike速降车 down hill bike表演车 freestyle小轮车 BMX公路车 city bike/road bike赛车 racing bike沙滩休闲车 beach cruiser场地自行车 track bicycle斜躺自行车re