1. Eletricity must be generated by the consumption of coal or oil
    发电需要消耗煤或石油.

2. While natural gas use increases, use of coal as fuel is decreasing.
    随着天然气利用量的增长，煤炭作为燃料的使用量正在减少。

3. This coal cokes well.
    这种煤容易炼成煤炭。

4. The modern city consists of monstrous edifices and of dark narrow streets full of petrol fumes, coal
    现代城市是由大得怕人的大厦和充斥着难闻的汽油味, 煤灰和有毒气体和又阴暗又狭窄的街道所组成,

5. The company envisioned opening the sides of two mountains to extract coal.
    这家公司打算挖开两座山的山坡采煤。

6. These men work underground for 6 hours at a time , mining for coal.
    这些人在地下工作一次挖煤6小时。

7. The substitution of coal for oil is desirable.
    以煤代替石油是可取的。

8. The post was coated with tar.
    这电线竿涂有焦油.

9. This truck carries 5 tons of coal.
    这部卡车载了5吨重的煤.

10. There are also endless numbers of birds in the tar as well.
    沥青坑里还有无数只鸟的尸体。