《换元》是连载于起点中文网的一本科幻幻想类小说，作者是秋风02。
... change of subject主项变换 change of variable换元；变量的换 characteristic equation特征(征)方程 ...
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换元法 method of substitution ; U-Substitution ; Element method ; Conversion method
可转换元素 [核] fertile element
置换元素 [化学] substitutional element ; replaced element ; replgeniusd element
转换元件 transduction element ; Transducing element
替换元素 replaced element ; block-level and replaced elements ; replace
非置换元素 non-replaced element
电感转换元件 Inductive transduction element
应变转换元件 Strain gauge transduction element
压电转换元件 Piezoelectric transduction element ; component of piezoelectric conversion
我们现在来说明积分的换元公式也一样好记。
We shall now show that the change of variable formula for integrals is just as unforgettable.
定积分换元法是定积分计算的主要方法之一。
The method of the definite integral by substitution is one of the main techniques among the definite integral calculation.
第二类换元法是一种既重要又不易掌握的积分方法。
The second method of transformation is an important but not-easy-to-master calculus method.
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