plus-minus tolerance 正负公差
We usually allow a tolerance of plus or minus 10%.
一般我们允许有正负10%的差额。
TOLERANCE, The part of a specific measurement that is allowed to vary in dimension. Usually given in a plus (+) or minus (-) format.
公差，特定量度容许有偏差的部份。通常以(+)或(-)的形式表示。
Astrologers use bell curves to chart astrological aspects, so that is why there is this plus or minus tolerance associated with so many of the dates I give you each month.
占星家使用贝尔曲线图的星相影响，所以这就是为什么会存在这种正或负偏差如此的日期我每月给你许多相关。
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