These contractions are so powerful that they can result in muscle tears or bone fractures.

这些肌肉收缩极其有力，甚至可引起肌肉撕裂，乃至骨折。

As muscle soreness develops, the body has to work to repair the muscle tears, but this doesn't happen immediately.

随着肌肉酸痛的发展，身体必须修复撕裂的肌肉纤维，但这一过程并不会立即进行。