例句與造句

1. coalpit _ desc; charcoal was created from wood in a low oxygen burning process . the coal was acceptable but the process was very time consuming and consumed a lot of wood
   木炭是由木材在缺氧條件下燃燒制得，很好用，但是燒炭很費(fèi)時(shí)，也會(huì)消耗大量木材。
2. It's difficult to find oxygen burning in a sentence. 用oxygen burning造句挺難的