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hard coal
chem. 硬煤 (美国指无烟煤，英国指褐煤以外的各种煤)
el. 硬煤无烟煤和烟煤的总称
interntl.trade. 白煤
met. 硬煤; 无烟煤
hard coal: 11 phrases in 6 subjects
Chemistry1
Construction1
Ecology1
Economy1
Oil / petroleum2
Technology5

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