As a usual practice, we only accept payment by LC, so we are much regretted for being unable to entertain your request of payment by DP.
通常，我们只接受信用证，因此很遗憾我们不能接受你们用DP付款。
As our usual practice goes, we require payment by confirmed and irrevocable letter of credit.
关于付款方式，我们要求不可撤销的信用证凭即期汇票支付。
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