保函怎么翻译?

银行保函翻译 高手帮忙
This Letter of Guarantee shall expire and become null and void upon receipt by the BUYER of all amounts hereby guaranteed or upon acceptance by the BUYER of the delivery of the VESSEL in accordance with the terms of the Contract as evidenced by the Protocol of Delivery and Acceptance of the VESSEL duly signed by the BUYER and the SELLER or on ____ whichever comes earlier, and in any case of expiration this Letter of Guarantee shall be immediately deemed null and void. After which you are to return this letter of guarantee to us through your bank. In case we have been informed, either by the SELLER or the BUYER, that arbitration proceedings have been commenced the validity of this Letter of Guarantee shall be automatically extended until thirty (30) days after the final arbitration award or judgment has been served upon you (the “last expiry date”), in which case payment shall be made to you upon presentation to us within the last expiry date of the final arbitration award or final court judgment which orders the SELLER to make the repayment.

英语保函
the Interim Payment Certificate; interim statements;payment certificates分别怎么翻译成中文,比较正式一点的.