opaque sky cover

例句：

1. 1. The sun was hidden behind the opaque sky cover of a thick fog.
   浓雾遮住了太阳，天空变得不透明。
2. 2. Thehikers were caught in theopaque sky cover of astorm.
   徒步旅行者被暴风雨的不透明天空覆盖所困。
3. 3. Thecity was shrouded in the opaquesky cover of heavy rain.
   城市被大雨的不透明天空覆盖所笼罩。