汉英对照/膝关节是人体最大的关节

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膝关节是人体最大的关节。 这是一个可以弯曲和伸展以及可以稍微旋转的关节。 它很容易受伤,很容易发展成关节炎。

The knee joint is the largest joint in the human body. This is a joint that can bend and stretch, as well as can rotate slightly. It is easily injured and can easily develop into arthritis.