An observer method exists for each attribute of a structured type.

observer方法是为某个结构化类型的每个属性而存在的。

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The method exists to ensure that science is as accurate as possible in explaining the world and that arguments rely on observable evidence.

这种方法的存在是为了确保科学尽可能准确地去解释世界，而它们的论据，依赖于观测得到的证据。

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A mutator method exists for each attribute of a structured type.

mutator方法是为某个结构化类型(structured type)的每个属性而存在的。

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