疼痛算是一种自然防护机制的作用。

Pain acts as a natural defence mechanism.

《牛津词典》

实验结果表明，系统有效地实现了闭环动态防护机制。

The experimental results show that the system has a closed-loop dynamic protection mechanism.

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根据智慧城市大量数据采集和交换的特点，重点实现访问控制的防护机制。

According to the characteristics of large amount of data collection and exchange in the smart city, the paper focuses on the protection mechanism of access control.

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