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The hardware and app are free, but Square takes a small cut of each transaction.
硬件和应用程序是免费的，但Square对每一笔交易收取一点点费用。
youdao
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Let D be a positive integer with square free.
设d是无平方因子正整数。
youdao
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Suppose D is a positive integer with square free.
设d是无平方因子正整数。
youdao
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Suppose D is a positive integer with square free.
设d是无平方因子正整数。
youdao