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to phrases
低级煤
gen.
dant
el.
fault coal
met.
lean coal
;
low-rank coal
;
inferior coal
tech.
drossy coal
低级
劣质
煤
met.
inferior coal
含硫
低级煤
met.
grizzle
低级
软
煤
tech.
dant
低级煤:
6 phrases
in 4 subjects
Geology
1
Metallurgy
1
Oil / petroleum
2
Technology
2
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