Despite the classification, there are more complex factors such as relational closeness, gender, age, and context that can affect how someone views physical contact.

尽管进行了分类，但还有一些更复杂的因素，如关系亲密度、性别、年龄和背景，可能会影响人们对身体接触的看法。

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He called for research into the physical causes of mental illness and established the foundations of the modern classification system for mental disorders.

他提倡研究精神疾病的生理成因，并制定了对精神疾病的现代分类体系。

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Conformance to a particular material classification in this standard requires meeting a number of minimum physical and chemical properties.

要符合这个标准下的特殊材料分类，需要满足一系列最低物理和化学性能要求。

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