plus or minusused to say that a number may be more or less by a certain amount 左右，大约 There may be a variation of plus or minus 5% in the prices that are quoted. 报价可能会有5%上下的变动。
plus or minus• The margin of error was plus or minus 3 percentage points.• Total return is interest earnings plus or minus any change in principal value.• Dealings take place at the price quoted plus or minus days' accrued interest.• The margin of error is plus or minus one percent.• It is consistent to within a value of plus or minus one, which is quite acceptable for a rough bound.• Typical instructions in this class increment or decrement an accumulator; here the implied value is plus or minus one.
→ plus or minus at plus1(1)