kneeguard

例句：

1. 1.He wore a knee guard during the game to protect his injured knee.
   他在比赛中戴了膝盖护具来保护他的受伤膝盖。
2. 2.The athletes were required to wear knee guards before the competition.
   比赛前，运动员们被要求戴上膝盖护具。
3. 3. The coach advised us to wear knee guards while playing basketball to prevent injuries.
   教练建议我们在打篮球时戴上膝盖护具以防止受伤。