在学习外贸函电本课后个人的收获和体会是什么?你认为一封写得好的商务信函应具备哪些特点？

dear sirs:we have received the above no.01/0501-fct l/c established by you in payment for your order no.shds03027 and when we checked the l/c with the relevant contract carefully,we found some mistakes.please modify it as follows:beneficiaryamount: say us dollars forty six thousand nine hundred and eighty only.date of shipment：change it to……partial shipments and transshipment are allowedwe hope you can amend it quickly.yours faithfully,