firedamp layer

例句：

1. 1. The firefighters were working tocontain the fire in the burned area.
   消防员正在努力控制着被烧毁区域的火势。
2. 2. The scientist found a layer ofwater that was not covered by the ice.
   科学家发现了一个没有被冰覆盖的水层。
3. 3.The engineer used a layer of plastic toprotect the building from the rain.
   工程师用一层塑料来保护建筑物免受雨水的侵害。