请帮忙翻译一句话，我们必须收到客户货款，才能享受外汇核销及其出口退税的政策，否则，出口的货物就无法核销，也无法享受到退税优惠。
We can make foreign exchange verification and get duty drawback only after we receive the payment for goods from clients. Otherwise, we cannot make the exported goods verification get duty drawback .
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