You can use wood coal.

你可以用木柴来取代煤。

The influence of amount of wood coal addition on the agglomeration of pack boriding agent with borax has been discussed.

探讨了木炭粉加入量对硼砂固体渗硼剂结块的影响。

We ran out of coal, and had to burn wood.

煤烧完了，只好烧木头。

Coal is extraordinarily abundant - we'll never run out - and pound-for-pound contains twice as much energy as wood.

地球上的煤炭异常丰富——我们用都用不完——同样体积的煤炭所含的能量是木头的两倍。

They use biomass fuels like wood, crop waste, animal waste or coal.

他们使用木材，作物废料，动物废料或煤炭等生物燃料。