There is no evidence to prove that it is true, but some vets believe that low thyroid levels can cause the nose to lose its color.

有些兽医认为甲状腺水平过低是导致雪鼻的原因，但并没有证据可以证明这一点。

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Symmetry. It would be symmetrical in its style of explanation. The same types of cause would explain, say, true and false beliefs.

对称性原则在解释的方式上必须对称。用同一种因素来解释正确与错误的信念。

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