肌肉中的神经细胞假如不能得到伸展，神经的传达会变得迟缓，肌肉会感觉酸疼，脑筋也会显得不灵活。
If the nerve cell in muscle cannot receive spread nerval is communicated can become logy muscle can feel acid aches brains also can appear not agile.
如果金鱼生长较慢，其尾部的伸展也会较为迟缓，能形成唯美的心形。
If the goldfish grows slowly tail will also stretch more slowly and comes into a heart shape.
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