- substitution line
- 代换: replacement; substitution; s ...
- 系: system; series
- 异种代换,异源替代系,异代换系: alien substitution
- 代换: replacement; substitution; substituting; substitute; replacing; [语言学] hypallage◇代换积分法 integration by substitution
- 反代换 逆代换: inversesubstitution
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