We usually allow a tolerance of plus or minus 10%.
一般我们允许有正负10%的差额。
2
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。
3
Astrologers use bell curves to chart astrological aspects, so that is why there is this plus or minustolerance associated with so many of the dates I give you each month.