她弯曲她的肌肉，手臂上的蛇随着肌肉而动了起来。
She flexed the muscles in her arm which made the snake slither.
正确的姿势有助于保持这些生理弯曲，而错误的姿势则相反——其将压迫或拉伸肌肉并引起疼痛。
Good posture helps maintain these natural curves, while poor posture does the opposite - which can stress or pull muscles and cause pain.
它的腿部弯曲，脚掌宽大，肌肉则因多年的苦役而变得很健壮。
His legs were bowed, his feet were wide, and his muscles were made strong by many years of hard work.
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