求翻译：用全额发票金额的保兑的，不可撤销的即期信用证支付，该信用证应于2009年4月30日前到达卖方，并在装运截止期后持续有效15天供在中国议付品质、数量和重量以中国商检局的检验证或卖方出具的证明为最终依据。是什么意思？

Confirmation of the full invoice amount, irrevocable sight letter of credit to pay the letter of credit shall be effective 15 days for negotiation in China, the quality and continued after the shipment deadline on April 30, 2009 reach the seller, quantity and weight certificate issued by the China C

Use the full amount of the invoice amount of the premium dollar, an irrevocable letter of credit for that period, the letter of credit shall be in April 2009 to 30 days before the seller shipping deadlines continue for 15 days in China and put quality, quantity and weight of the China Commodity Insp

Cannot be abolished the immediate letter of credit payment guarantees cashing which with the sum total invoice amount, this letter of credit should arrive the seller before April 30, 2009, and continues effective 15 day after the shipping closing date for in the Chinese negotiation quality, quantity

Confirming the amount of the invoice in full, irrevocable letter of credit payment, seller is encountered before the letter of credit are due on April 30, 2009, and continue in force for 15 days after the shipping deadline for negotiation in China the quality, quantity and weight by China commodity

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