求翻译：因为打样品之后，为了确保信用证的交期，我们开始生产大货。当你在11月14日通知更改车架头管的时候，我们的20车架和24车架已经生产，当时我们也有给你打过电话，说过此事， 如果更改的话，需要增加2.5美金每台的更改费，你也同意了。但是重新生产，交期需要到12月25日，所以你需要更改你的信用证。 我在12月2日的邮件中告诉你如何更改信用证。是什么意思？

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Because the following sample, in order to ensure the exchange of letters of credit period, we commenced production of large volume. When you are in a November 14 change notification frame head pipe, our 20 trailers and 24 trailers at that time, we have produced a call you, said, If the change, the n

Because after hits the sample, in order to guarantee the letter of credit the delivery date, we start to produce the big goods.When you informs the change frame flageolet in November 14 time, our 20 frames and 24 frames already produced, at that time we also had to you have telephoned, have said thi

Because the samples, in order to ensure that the delivery of the letter of credit, we started mass production. When you're notified on November 14 when changing the frame head tube, our 20 and 24 frame frame had produced, then we also have to telephone you, said the incident, if you change the need

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