Subject + 覆盖 + Object
覆盖 (fùgài) means to cover or blanket an area. It is used when something spreads over or covers a surface, such as volcanic ash covering islands. For example, 火山灰覆盖了这些岛屿 means "volcanic ash covered these islands."
大雪覆盖了整个城市,到处都是白色的。
Dà xuě fùgài le zhěnggè chéngshì, dàochù dōu shì báisè de.
Heavy snow covered the entire city — everything was white.
这片森林覆盖了将近一万平方公里的面积。
Zhè piàn sēnlín fùgài le jiāngjìn yíwàn píngfāng gōnglǐ de miànjī.
This forest covers an area of nearly ten thousand square kilometers.
沙尘暴过后,桌子上覆盖了一层灰。
Shāchénbào guòhòu, zhuōzi shàng fùgài le yì céng huī.
After the sandstorm, a layer of dust covered the table.