一个沉重的背包迫使肌肉和脊椎来平衡那些不均的重量。
A heavy backpack forces the muscles and spine to balance the unequal weight.
你也可以因其他原因获得更多的重量，如增加肌肉，但是你得积极一些，沉重的训练及多吃。
You can also gain more weight for other reasons such as increased muscle, but you would need to be doing progressive, heavy resistance training and eating more calories over time.
一般来说，眼周肌肉包括上睑提肌的沉重，和全身其他肌肉的疲劳类似。
Generally speaking, heaviness of the muscles around the eyes, including the levator muscles that open the upper eyelids, is similar to fatigue of any muscle of the body.
应用推荐