Conclusion ART such as trachea intubation and tracheotomy, which can damage respiratory tract natural defensive function, is one of the risk factors of HAP.

结论气管插管与气管切开等人工气道的建立，破坏了呼吸道的自然屏障，是下呼吸道感染的危险因素之一。

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From a theoretical point of view, it is generally believed that the neurological symptoms of these cases are in the implementation of a defensive function to prevent the outbreak of psychosis.

就理论的角度而言，一般都认为，这些病例中的神经症症状是在执行一种防御功能，以防止精神病的爆发。

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Soon enveloped by an expanding city, the fortress lost its defensive function, and in its place came a royal palace.

BBC: Classic sights in the City of Light