The standard deviation is the square root of the variance.
标准差是方差的平方根。
Square a basketball rim to a same area of the standard round one.
把篮球比赛用的篮框做成正方形，面积保持与标准篮框一样大。
The positive square root of the variance is called the standard deviation.
方差的正的平方根叫做标准差。
The existing 1,000 square meter factory standard four plants.
工厂现有四栋一千平米的标准厂房。
The existing 1,000 square meter factory standard four plants.
工厂现有四栋一千平米的标准厂房。
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