Certainly, all three operators-the single, double, and back quotation marks-serve a valid purpose, but like exceptions in English, memorizing and mastering the variations can be maddening.
当然，这三种操作符(单引号、双引号和反撇号)都有合法的用途，但是与英语中的例外一样，记住和掌握这些细微差异很令人头疼。
All documents relating to the inquiry including copy of the formal quotation and supporting documents will be retained in the inquiry file.
所有询价的相关文件，包括正式报价和证明文件的副本，将保存在询价文件中。
This information will be circulated to all personnel involved in quotation preparation process to ensure that future inquires are successful.
本信息将分发给所有参与报价准备过程的人员，保证进一步询问的顺利进行。
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