Anti-corrosion treatments such as paint touch up shall be completed when mechanical damage such as drilling or sawing occurs.
防腐蚀处理，如油漆润色时，应完成的机械损伤，如钻井或锯发生。
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.
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。
And famously, Turner used the time not to touch up his work but often to paint entire canvases almost from scratch.
透纳出名的是，他不是用这个时间来润色，而是经常几乎从头画起。
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