请外贸函电的高手帮忙看看这些翻译有什么问题没有 急求~！！！！！

Question

In order to cover ourselves for this shipment.为了支付我们这匹货物。We have drawn on the Bank of Singapore at sight for GBP 20000 under L/C No. FR230 and negotiated it through the Bank of China, Shanghai.在号码为FR230的信用证下，我们已经在新加坡银行开立了一张价值20000英镑的即期汇票，并由中国银行上海分行议付。The shipping documents are to be surrendered upon payment of the draft at your end.一旦你国家那方支付汇票的款额，货运单据会被提交。We enclose invoice for your Order No. TH430K which we shipped yesterday per S.S. “flying clouds”.我方随函附加你方订单号未TH430K的发票，该货于昨天以由“飞云”班轮装运。Meanwhile, kindly give our due honor when presented to you from your banks.同时，请当你方银行提示时，你方能做出预期的支付。

Answer 1

问题还是有的 许多地方说的不专业。
AS FOR PAYMENT,WE HAVE ISSUED AN SIGHT DRAFT PAY TO THE ORDER OF BANK OF CHINA SHANGHAI BRANCH THE SUM OF GBP 20,000 DRAWN UNDER BANK OF SINGAPORE L/C NO.FR230。
FULL SET OF DUCUMENTS WILL BE PRESENTED WHEN PAYMENT IS DONE.
WE ENCLOSE HEREWITH THE INVOICE FOR YOU P/O NO.TH430 DELIVERED BY S.S."FLYING CLOUDS".
BY THE WAY, PLS GIVE OUR DUE HONOR WHEN YOU ARE PRESENTED,WE WILL APPRECIATE VERY MUCH.