What are the different types of letters of credit and how are they used?

那么信用证的种类又有哪些？他们的各自作用又是为何？

youdao

Sure. . We handle all types of letters of credit, and also advise if they should be irrevocable.

斯：可以，我们操作各类信用证，并且提供相应的咨询-例如建议哪些应做不可撤销信用证。

youdao

Letters are important means of communication. Generally speaking, there are two types of letters, business letters and personal letters.

信函是交流的重要手段。一般而言，有两种信函形式，商务信函和私人信函。

youdao

In creating the recipes for their new book, Greta says she learned from readers' letters what types of dishes people make most often and what types of ingredients they like to use.

CNN: Word of mouth