同时，由于主缆为不可更换构件，因此主缆的寿命直接影响悬索桥的使用年限。
Meanwhile, as the main cable can not be replaced, the life of main cable is to affect the bridge service life directly.
目前不少飞机已超过了原来的使用设计寿命，这些飞机上损伤的构件往往需要更换。
Nowadays many aircraft are operating longer than originally intended. The damaged components of these aircraft need to be replaced.
凡弯曲、变形的杆件应先调直，损坏的构件应先修复，方能入库存放，否则应更换。
Whoever bending deformation, the rods shall first straightening, repair damaged components should first, can store incoming, otherwise should be replaced.
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