即使再强健的肌肉也需要时间来恢复。
Even muscles that feel strong and healthy need time to recover.
首先，这种甲虫体短，只有一英寸长，但却浑身是强健的肌肉。
First, these beetles are nearly an inch long and packed with powerful muscles.
钙不仅对强壮健康的骨骼重要，而且对强健的肌肉也很重要。
Calcium is not just essential for strong healthy bones, but also for healthy muscles.
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