As he did so, he reflected that, since pity for suffering was one of the most elementary forms of egotism, he ought to have remembered that it was necessarily one of the most tenacious.
在这样做的同时，他想到，既然对苦难的怜悯是最基本的自负形式之一，他应该记住它必然是最顽固的自负形式之一。
Elementary form
原声例句
人与鬼（下）
中文百科
初等函数 Elementary function
（重定向自Elementary form）
初等函数（基本函数）是由常函数、幂函数、指数函数、对数函数、三角函数和反三角函数经过有限次的有理运算（加、减、乘、除、有理数次乘方、有理数次开方）及有限次函数复合所产生、并且在定义域上能用一个方程序表示的函数。
一般来说，分段函数不是初等函数，因为在这些分段函数的定义域上不能用一个解析式表示。
英语百科
Elementary function 初等函数
（重定向自Elementary form）
In mathematics, an elementary function is a function of one variable which is the composition of a finite number of arithmetic operations (+ – × ÷), exponentials, logarithms, constants, and solutions of algebraic equations (a generalization of nth roots).
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