| Expression | 焦炭，煤气和汽油是更加有效地利用煤和石油的第二级燃料的范例。 |
|---|---|
| Meaning | The gas and petrol are examples of secondary fuels by which coal and oil may be more effectively used. |
| Reading | jiāo tàn， méi qì huò qì yóu shì gèng jiā yǒu xiào de lì yòng méi huò shí yóu de dì èr jí rán liào de fàn lì。 |
Tags: hsk4-limited4-part4
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