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Revisando el contexto, me quedó así:
Salt has been very VALUABLE throughout history. As people started COLLECTING rice and wheat, they got less salt from red MEAT. Therefore, they needed to find other SOURCES of salt. First, people in China began MINING salt from lakes. Later in Central Asia, FARMING and EVAPORATION methods were used. Finally, the Chinese produced salt by BOILING seawater. Because these methods took a long time, salt was so valuable that it was used as MONEY. It has become CHEAPER today, but it still remains an important part of our diet.
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