The system of civil aviation includes airline companies, airports and air-traffic management departments.

民用航空体系主要由航空公司、机场和空中交通管理三大部分组成。

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However, there exist a lot of problems and weak links in safety management of China's civil aviation airports, so the civil aviation safety is threatened.

然而，我国机场管理的问题和薄弱环节客观存在，对航空安全产生了潜在的威胁。

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