Enterprise's IC especially intellectual property has the defensive function, Certainly also has the combative function.

企业的智力资本特别是其中的知识产权具有防御性功能，当然也具有进攻性职能。

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Tuberculosis can be prevention and control at all only if improving internal and external environment and enhance immune defensive function of human body.

只有改善机体的内外环境，提高机体的免疫防御功能，才能从根本上防治结核。

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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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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