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Discover LudwigThe phrase "be on topic" is correct and commonly used in written English.
It is typically used to indicate that something (a conversation, discussion, etc.) should pertain to the subject or main point that is being discussed. Here are a few examples: - "Let's stay focused and be on topic during our meeting today." - "His remarks were not relevant to the discussion and were therefore not considered to be on topic." - "The moderator reminded the panelists to keep their responses concise and on topic." In these examples, "on topic" refers to staying relevant to the main subject or point of the discussion.
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So comments from readers should be professional, should be on topic and should further the discourse with related criticism and opposing points of view.
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A number of childrens' books are on-topic, too.
But it's on-topic, and gets extra points for displaying some of that Townes Van Zandt working-man optimism.
However, crowd-labeling showed that more than 79% tweets are on-topic first person tweets compared to 45% for flu.
As long as it's on-topic, I feel that information is power.
"If you study psychology, half your courses might be on topics you're not interested in.
But there's one topic on which they agree.
"I've been figuring out what's on topic and what's off topic.
"I think my first words were, 'On topic only, please,' " he said.
So comments that add nothing of substance to the discussion, even if they are on topic, will not be posted.
It will also provide general feedback, like telling a student whether an answer was on topic or not.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com