Then, based on defining three conceptions called as the second order spectrum, two theorems about the second order spectrum were proven.

然后，以定义三个叫做二阶谱的概念为基础，证明了两个关于二阶谱的定理。

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Then, based on defining three conceptions called as the second order spectrum, two theorems about the second order spectrum were proven.

然后，以定义三个叫做二阶谱的概念为基础，证明了两个关于二阶谱的定理。

youdao