膝盖关节对于行走和跑步至关重要。

The knee ___joint is essential for walking and running.

过度劳损可能导致关节损伤。

Excessive strain can lead to damage in the ___joints.

外科医生可以进行手术，用人工关节替换受损的关节。

Surgeons can perform operations to replace damaged ___joints with artificial ones.