求翻译：买方应通过卖方可以接受的银行于装运月份前45天开出并送达卖方见票后60天付款的信用证，于装运后15天在上海议付有效是什么意思？

45 days prior to the month of shipment, the buyer should the seller can accept bank out and served on the seller 60 days after sight payment letter of credit, 15 days after shipment for negotiation in Shanghai

The buyer shall, through the seller can accept in the bank before shipment in 45 days and was given to the Seller after the 60 day payment credit, 15 days after the shipment in Shanghai put the effective

The buyer should the bank which may accept through the seller previous 45 days start out and deliver the seller at sight latter 60 days payments in the shipping month the letter of credit, in ships latter 15 day to be effective in the Shanghai negotiation

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