回复求助。。。求大神，紧急

　　回复求助。。。求大神，紧急。是关于格式要求的，刚投过去，编辑就返回来要求我修改，可是我对具体符号这方面真的是看不太明白，也不敢胡乱改
各位有经验的大神给看看，这到底是怎么个意思
本人在此跪谢

thank you for this submission! Please make some formal corrections to meet the journals requirements (see Instructions for authors and the MANUSCRIPT CHECK LIST (PDF), as well):

- Differential symbol d and big <delta> (for any difference) should be written upright / not in italics.

- Units of quantities should also be written upright.

- For the review stage, please re-format the text to single column!

Please edit your submission and make the necessary changes by logging into the Editorial Manager
===有问必答===
- Differential symbol d and big <delta> (for any difference) should be written upright / not in italics.
微分符号d和大写的delta不要用斜体。
- Units of quantities should also be written upright.
数量的单位也不要用斜体。
- For the review stage, please re-format the text to single column!
在审稿阶段，正文请用单栏，不要用双栏。