每一种新型飞机投入使用前必须制订一份维修大纲，以保持飞机的固有安全性和可靠性。
The maintenance program must be prepared to insure the security and reliability before operating for the new type aircraft.
每一种新型飞机投入使用前必须制订一份维修大纲，以保持飞机的固有安全性和可靠性。
The maintenance program must be prepared to insure the security and reliability before operating for the new type aircraft.
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