倒易定理

reciprocal theorem的用法和样例：

例句

This section is devoted to the proof of a reciprocal theorem between a pair of elastodynamic states.这一节将专门来证明一对弹力动力状态之间的倒易定理。
There are a number of alternative formulations of the reciprocity theorem.还有许多别的互易定理的公式。

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