a black or dark brown form of coal which has a high calorific value but the burning of which is that gives a lot of heat but is also a major cause of air pollution
| 单词 | bituminous coal |
| 释义 | bituminous coalnouna black or dark brown form of coal which has a high calorific value but the burning of which is that gives a lot of heat but is also a major cause of air pollution |
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