Web加法运算符是人类最早掌握的运算符 ∵ “∵”：数学专用术语，表示“因为”的意思。 “∴”（所以）是瑞士数学家Johann Rahn 首先使用的。 他在1659年出版的一本数学书《Teusche Algebra 》里以“∴”及“∵”两种符号表示“所以”，其中以“∴”用得较多。 ∑ ∑ 是一个求和符号，英语名称：sigma，汉语名称：西格玛（大写Σ，小写σ）第十八个希腊字母。 在希腊语 … Webchange, alter, vary, convert, modify, transform, turn. 这些动词均含有"变化，改变"之意。 change ： 指任何变化，完全改变，强调与原先的情况有明显的不同。; alter ： 常指轻微的改变，强调基本上保持原物、原状的情况下所进行的部分改变。; vary ： 暗示不规则或断断续续地变。; convert ： 指进行全部或局部 ...

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老外说“What do you want”可不是问你“要什么”！真正的意思是…

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