knee supporter

• 护膝

knee supporter的用法和样例：

例句

1. Elbow pads and knee pads are essential on a skateboard.
   滑滑板时带护肘和护膝是必要的。
2. The trousers have double thickness knee panels for extra protection.
   这条裤子上有双倍厚的护膝片以加强保护。