It is a well-known fact that Bridges are subject to deterioration, particularly over a period of twenty years, no matter how well designed they may be.

一个众所周知的事实是，所有桥梁的状况都会每况愈下，尤其是经历了20年这样长的时间之后，无论它们当时设计得是如何精良。

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This cabling is heavy and subject to deterioration due to harsh environmental conditions encountered in normal flight operations.

在正常航班运营中，如果受到恶劣的环境条件影响，这些电缆由于沉重会加剧损耗。

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