影片介绍
"Thesulphur-ironmineislocatedatthecommonboundaryofSichuan,Yunnan,andGuizhouprovince,withanareaof1774squaremeters.TheYongNingRiveroriginatedfromhere,flowingnorthward108kilometersintotheYangtzeRiver.Theminewasestablishedin1950anditsproductsaremainlyexported,withsomeconcentrateduseswithininthecounty.Wefoundthisplaceinth...
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