单词：universal identity
universal identity的用法和样例：
例句
- An identity is true regardless of the values of its variables.恒等式中的变量变化不影响恒等式的成立。
- After that, people found the identity has many different applications, especially on regularity and non-existence of solutions about PDEs.自此以后，人们发现该恒等式有很多用途，尤其是在研究偏微分方程中解的存在性和唯一性方面。
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