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类别全部 - disease - pollution - commerce

作者：Larry F Sommers 7 年以前

929

Coal

This is a sample mind map

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Coal

Item of commerce

Fossil record

Nasty stuff

Air pollution

Lung disease

Dirty

Byproducts

Airborne soot

Ashes

Clinkers/cinders

Fly ash

Household heating

Child chore

Furnace