This article is written for you, if you have been told recently by a journal editor that your manuscript needs to be edited by a “native speaker.”
If you think you are paying for editing one manuscript, then you are only half correct. Why? Please let me explain.
You can read many books about how to write a research paper, but you cannot write well unless you write it yourself, revise it (many times), and have it edited (either by an experienced co-author or colleague, or by an English editor who has a strong science background in a field close to yours).
If you wrote the manuscript yourself, you would benefit most (more than your co-authors who did little writing), if you go over the tracked changes carefully. You should feel the manuscript reads more smoothly after being edited, and as a result your ideas and reasoning are better expressed. (If not, then you should try a different English editor next time.) You should try to understand why the editor made each change. If you don't understand why, you should ask the editor to explain it. (If he refuses, then you should try another English editor next time.)
In addition, you should share this edited manuscript with your co-authors so they can learn as well. If you have students, let them study the edited manuscript. If you follow my advice, you will get your money’s worth.
Zuojun: This is something I have learned from and shared with my clients. When my clients improve their English, I will receive a much better manuscript next time. Then, I can improve the writing further because revising (including editing) is the key to good writing.