如果能观见腹部运动刹那刹那间快速变化，那么将难于对这样的运动作标记。
If it can be perceived to be changing very fast from one moment after another, then, it will be difficult to put labels on the movement.
那种前后运动也能调节你腿部和腹部的肌肉。
That back-and-forth movement also adjusts the muscles in your legs and belly.
几个星期的有氧健身运动将使松弛的腹部结实。
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