Definitions

[1] (美国陆军)航空燃料辛烷值测定法

[2] 航空燃料评价法

[ fjuəlz ]

1. Coal and natural gas are natural fuels.
   煤和天然氣是天然燃料。
2. As a result of some factories using fossil fuels, chemical emissions have already caused serious environmental problems.
   由于一些工厂使用矿物燃料，化学品的排放已经产生严重的环境问题。
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