n. fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period
v. supply with coal
v. take in coal
n. 煤, 木炭
v. 加煤
1. Coal is used to generate electricity in many countries.
煤在许多国家用于发电。
2. The factory burns coal to produce heat for its machines.
工厂燃烧煤来为其机器提供热量。
3. Some people believe that coal mining can harm the environment.
一些人认为煤矿开采会对环境造成伤害。