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.
在很短的时间内，被子植物就覆盖了夏威夷许多原本光秃秃的土地。
In a surprisingly short time, angiosperms filled many of the land areas on Hawaii that had been bare.
加拿大的北极是一个广阔的、没有树木的极地沙漠，一年中大部分时间都被雪覆盖着。
The Canadian Arctic is a vast, treeless polar desert that's covered with snow for most of the year.
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