他们应该保持在孩子们叫一声就能听得到以及能马上跑过去的距离之内。
They should always be within shouting and running distance of their children.
正态分布数据认为，样本中约68%的数值分布在距离平均值为1的标准偏差之内。
Normally distributed data assumes that about 68% of the values in the sample are within 1 standard deviation of the mean.
当你和穿着另外一件衬衫的你的另一半在一个拥抱的距离之内，你们两个衬衫上的心就会点亮，最终全部亮起来。
But get within hugging distance of your significant other wearing the matching shirt and suddenly the hearts on both of your shirts start to light up until you're fully powered up.
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