（1）全面变异（overall variation）：为各次试验结果之差异，以标准差表示， 用于评估混凝土品质之均匀性，标准差愈大，表示混凝土品质愈不均
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... variation : 变异，变差，差异；变动；变分 overall variation : 总变差 var. (variation) : 变异，变差，变动 ...
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Yet the overall variation is tiny, just 0.1% of the sun's total output, which seems insufficient to be the cause of a warming Earth.
ECONOMIST: The sun has gone quiet
However, the overall measure masks significant variation across the country.
FORBES: Small Business Employment Hasn't Been Hit Hard Everywhere
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