coal

• 一种黑色或深棕色的可燃沉积岩，主要用作燃料来源。

A black or dark brown combustible sedimentary rock used primarily as a fuel source.

不可数

1. Fuel materialB1formal

   A black or dark brown rock consisting mainly of carbon, used as a fuel.

   燃料材料

   • The power plant burns coal to generate electricity.
   • Miners extract coal from deep underground.
   • Coal was the primary fuel during the Industrial Revolution.

2. Burning pieceB2formal

   A piece of glowing or charred material from a fire.

   余烬

   • He placed a hot coal into the iron to press clothes.
   • The campfire coals glowed red in the darkness.
   • She roasted marshmallows over the hot coals.

   同义词cinderclinkerember

• 动词，指给某物供应或装载煤炭，或把煤作为燃料装入其中。

A verb meaning to supply or provide with coal, or to take in coal for fuel.

1. To supply with coalB2formal

   To provide or fuel something with coal.

   给…加煤

   • The ship was coaled before its long voyage.
   • They coaled the steam engine for the journey.
   • The workers coaled the furnace overnight.

   同义词chargefuelstoke

2. To convert into coalC1formal

   To turn organic material into coal through natural processes.

   变成煤

   • Over millions of years, the peat coaled into lignite.
   • The ancient forests coaled under immense pressure.
   • Geologists study how plant matter coaled in prehistoric times.

   同义词carbonizechar