我想来想去，压根儿就没有跟广发银行有过交易怎么会有欠单呢？
I thought it over again and again, I have never been doing business with this bank, I have no idea how this RMB90 comes.
因为这是为了作交易而设的，就是用支票付欠单，买东西和寄钱等等。
That is, writing checks to pay for bills, buying things and sending money.
因为这是为了作交易而设的，就是用支票付欠单、买东西和寄钱等等。
It's primarily designed for business transactions. That is, writing checks to pay for bills, buying things and sending money.
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