商榷信的英文：
letter of discussion
n. 字母；信；字面意义；证书，许可证；文学
v. 用字母标明，写字母于；写印刷体字母；赢得校名缩写字母标志
in letter and in spirit
在字面意义和精神实质上|无论形式和实际
The letter was a forgery.
这封信是伪造的。
Post the letter through the slit in the letter box.
把这封信从信箱的投信口投进去。
Imprint a postmark on a letter =imprint a letter with a postmark
盖邮戳于信上
The letter is directed to him.
这封信是写给他的。
n. 讨论，谈论
Stop discussing for the moment, please.
请暂停讨论。
They discussed the weather and other topics.
他们讨论了气候和其他的话题。
The discussion deteriorated into a bitter quarrel.
这场讨论演变成了激烈的争吵。
We will discuss the proposal at the meeting.
我们将在会议上讨论这项提议。
The question was warmly discussed.
这个问题经过了热烈的讨论。