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。
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。
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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