| 释义 |
〔formula〕A symbolic representation of the composition or of the composition and structure of a compound.分子式:表示化学物质成分或组成方式的符号表达式〔cancel〕To remove (a common factor) from the numerator and denominator of a fractional expression.约分:从一个分数表达式的分子和分母去掉(一个公因子) |