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.
采取被推荐的多层保护是唯一能抵抗不祥的未知威胁和各种已知威胁的办法。
Taking the recommended layered approach is the only surefire way to protect against the plethora of known threats - as well as the ominous unknown dangers.
在多层身份验证中，身份验证层表示是否需要额外的身份验证才能访问受保护的对象。
In multi-layer authentication, the authentication levels denote whether additional authentication is necessary to access a protected object.
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