用英语解释句子 In ancient times,people used shells as money

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用英语解释句子 In ancient times,people used shells as money
还有There are at least 20 girls in myclass用英语解释句子!!!!!!!!

In ancient times,shells was used as money.In ancient times,people used shells to exchange their goods and/or services.I have at least 20 girl classmates in my class.There are at least 20 girls in my class呢?At least 20 of my classmates are girls.