考虑一类特殊的对称毛毛虫，即除悬挂点外对称点度数相等的毛毛虫的多级距离数，所得结果改进了相关文献的结论。

A class of particular symmetrical caterpillars is studied, and its multi-level distance number is obtained. The results improve the conclusion of related literature.

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除了巨大的兴趣外(毕竟它将会正统在回答“为什么我们在这里”的问题)，这样的结果对于本身也将是一个值得欣喜的对称。

Besides being of huge interest (it would, after all, be a legitimate answer to the question "why are we here?"), such a result would also have a pleasing symmetry of its own.

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我们知道，目前除了蝶阀和隔膜阀在结构上完全对称外，所有其他结构的调节阀都是不对称的。

We know that, with the exception of butterfly valve and the valve is completely symmetrical in structure, all other structures are asymmetric valve.

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