commercial letter

• 商业信件

commercial letter的用法和样例：

例句

1. Clarity is very important for a business letter.
   文笔清晰对于商业信件非常重要。
2. They can hold their own in the spoken language, but would find it hard to compose a business letter in Chinese through lack of usage.
   他们完全有能力用华语同他人沟通，不过，因为疏于练习，要用华文书写商业信件便力不从心。