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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。

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Each session has a theme,and participants are given a variety of materials and prompts and asked to cover surfaces with their thoughts and art.

每个会议都有一个主题，参与者会收到各种各样的材料和提示，并被要求利用自己的奇思妙想和技巧来填补空白。

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Crafters and knitters get together and crochet pieces of art to cover public furniture or sculpture.

BBC: Knitters transforming Newcastle's public spaces

Those who self-identify as avid readers and rely on cover art to identify the myriad subgenres within the romance category complained that the new cover obscured the novel's meaning.

CNN: Explaining 'Fifty Shades' wild success

Last week, that happened to be the revelation of the cover art for Bioshock Infinite.

FORBES: Ken Levine Explains that Bioshock Infinite's Bland Cover is for 'Frathouse Appeal'