L/C 翻译请求外贸专业翻译，最好能解释一下为什么要延展信用证。谢谢！L/C NSW6180 TIN PLATE ARR

L/C 翻译
请求外贸专业翻译，最好能解释一下为什么要延展信用证。谢谢！
L/C NSW6180 TIN PLATE ARRIVED ONLY TODAY JULY SHIPMENT
IMPOSSIBLE EXTEND SHIPMENT VALIDITY 31/8 15/9 RESPECTIVELY
背景资料：
Dear sirs,
L/C No. NSW6180
We confirm our cable of yesterday,reading as follows:
L/C NSW6180 TIN PLATE ARRIVED ONLY TODAY JULY SHIPMENT
IMPOSSIBLE EXTEND SHIPMENT VALIDITY 31/8 15/9 RESPECTIVELY
We trust that you have received the above cable and are doing what is necessary.
As stipulated in S/C 89STX-5491,shipment could be made in July provided your L/C reached us not later than 15th. However,we received your L/C only yesterday and it is absolutely impossible for us to ship the goods in July.
Under the circumstances,we regret to ask you to extend the above L/C to August 31st and September 15th for shipment and negotiation respectively,with the amendment to reach us by the 15th July; otherwise shipment will be further postponed.
We look forward to receiving the relevant amendment at an early date and thank you in advance.
Yours faithfully,