1. We regret we cannot accept your payment term. 很抱歉，我们不能接受您的付款条件。

We regret 开头的句子，缓和了气氛，委婉地表示自己的立场。

2. It's our pleasure to work with you. Please understand that we need to take the cash flow into the consideration / consider our cash flow/ consider the turnover of the capital. 我们很高兴与您合作。我们也得考虑到资金周转…

①cash flow 现金流，资金周转

②take..into consideration 考虑到..

3. The raw materials have been out of stock. We need to get your advance payment so we can order the materials for production. 目前原材料已无库存，我们需要收到你方定金，才能定材料安排生产。

①be out of stock 无库存

②advance payment 定金

4. We really want to work with you but it's very hard for us to accept O/A 60 days. As first cooperation, it will be absolutely rejected by our financial department. 我们确实很想和你合作。但是第一次合作，O/A 60天我们财务部是绝对不会批示的。搬出有关部门比如财务部和客户谈判。

①O/A 60 days 账期60天

②financial department 财务部

5. Please allow me to report to our director and see how we adjust to meet your requirement. 请允许我和我的上司沟通下，看看如何回应你的要求。

在这种付款方式上，表示自己不是决策人，打太极，防止客户咄咄逼人。

①report to sb. 汇报给某人

②meet one's requirements 满足某人的要求