大家帮忙用英语解释一下这些经贸口语的专业术语.

信用证 :letter of credit
保兑信用证:confirmed credit
不可撤销信用证:irrevocable letter of credit
即期信用证:sight letter of credit
承兑交单:document against acceptance
付款交单:document against payment
船厂上交货价格:dockyard delivery price
成本加运费价格:cost of freight
成本加运费加保险费价格:cost of freight and insurance price

哇，我会，但是太多了，可以加点分不啊？