If you go back to the first nations, so, thousands of years ago, the people who lived along the Yellow River in China -- it was many, many different tribes and they all depended on the river for survival and for prosperity, but all of them also suffered from periodical floods and periodical droughts.
Se voltarmos às primeiras nações, milhares de anos atrás, as pessoas que viviam ao longo do Rio Amarelo na China eram muitas tribos diferentes e todas dependiam do rio para sobreviverem e prosperarem, mas todas sofriam de cheias periódicas e secas periódicas.