单词	plus/minus sign
释义	plus/minus sign noun : the sign ± used to indicate a quantity (such as 2 in "the square root of 4 is ±2") taking on both an algebraically positive value and its negative and to indicate a plus or minus quantity (such as 4 in "the population age was 30 ± 4 years") called also plus/minus symbol Word History First Known Use 1971, in the meaning defined above Kids Definition plus/minus sign noun : the sign ± used to mean that a quantity (as 2 in "the square root of 4 is ± 2") takes on both a positive and a negative value or to indicate a plus or minus quantity (as 5 in "the scale was accurate to ± 5 grams") called also plus/minus symbol
随便看	second wind second world Second World War second-best second-class second-class citizen second-cut file second-degree second-degree burn second-drawer second-first second-foot second-generation second-guess second-guessed second-guesser second-guesses second-guessing second-handedness second-in-command second-in-hand second-line second-order reaction second-rate second-rateness

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