腘绳肌是覆盖大腿后侧的三条长条形肌肉。

The hamstrings are three long muscles that cover the back of the thighs.

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背景：腘绳肌撕裂是较常见的运动损伤。

Background: The torn hamstring is a common athletic injury.

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背景：腘绳肌撕裂是较常见的运动损伤。

Background: The torn hamstring is a common athletic injury.

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