Althoughmanhasknownasbestos(石棉)formanyhundredsofyear...
问题详情： Althoughmanhasknownasbestos(石棉)formanyhundredsofyears,itwasnotuntil160yearsagothatitwasminedforthefirsttimeontheNorthAmericancontinent.H.W.Johns,ownerofaNewYorkCitySupplyShopforroofers...