你不必先付款。
我们先付款给工厂。
除非你们先付款，否则我们不发货！
装新电话系统我们必须预先付款。
We have to pay in advance to have the new telephone system install.
我们的付款条件是先付款后发货。
只要你预先付款，我们可以给你订座。
只要你预先付款，我们就不收你送货费。
As long as you've paid in advance we won't charge you for delivery.
因为是先付款，一些商品的质量难以保证。
Also the quality of the goods is not guaranteed, as we must pay first.
你们必须预先付款。
我们会预先付款。
公司要预先付款。
吉姆：唯一的要求就是在交货之前先付百分之二十五的预付款。
Jim: The only requirement is an advance payment of twenty-five percent before delivery.
吉姆：唯一的要求就是在交货之前先付百分之二十五的预付款。
Jim: The only requirement is an advance payment of twenty-five percent before delivery.
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