Wedonotknowwhenmanfirstbegantousesalt,butwedoknowthatit...
问题详情：Wedonotknowwhenmanfirstbegantousesalt,butwedoknowthatithasbeenusedinmanydifferentwaysthroughouthistory.Historicalevidenceshows,forexample,thatpeoplewholivedover3,000yearsagoatesaltedfish.Thous...