Sun's robotic prosthetic knee earned him fame and won him the Red Dot Best of the Best award in 2020.

孙小军因机器人假肢膝关节声名鹊起，并以此斩获了 2020 德国红点最佳设计奖。

Plastic prosthetic knees have to be replaced after about 20 years.

大约 20 年后必须更换塑料假肢膝盖。