运动员正在用力投掷标枪。
左膝关节速度变化最大，是积极主动用力来带动身体下肢向投掷方向转动。
Maximum rate of change of left knee, is a proactive force to bring the body to throw the direction of lower limb rotation.
身体右侧，以踝关节积极主动用力为主，带动身体下肢向投掷方向转动。
Body on the right to force the main active ankle, pushing the body to throw the direction of lower limb rotation.
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