D: That's why I've come to Beijing. I want to discuss with you the mode of payment for the tube mill under negotiation.
D: That's why I've come to Beijing. I want to discuss with you the mode of payment for the tube mill under negotiation.
杜：这就是我来北京的原因。我想和你讨论一下正在洽谈的钢管厂的付款方式问题。