有时候艺术品真迹看起来是赝品，是因为很多修护人员添加了很多层保护膜，以覆盖油画上的损伤；而随着时间的推移，画作上损坏的地方已经恶化了。
Sometimes original art works appear questionable or inauthentic because they've had so many restorers add touch-up layers to cover up damage, damage from the paint having deteriorated over time.
不沾涂层是必要的，它可随着时间的推移而损坏。
A non-stick coating is required and can be damaged over time.
桥梁伸缩缝是当前比较容易出现的问题，随着时间的推移，损坏程度逐渐加剧。
The bridge expansion joints are more prone to have problems at present, as time goes on; the extent of damage gradually increases.
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