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"during certain times" is correct and usable in written English.
You can use it when you want to refer to a period of time in the past or the present when some criteria is met. For example, "During certain times of the year, the city becomes very crowded."
Exact(60)
Thus, there can be increased stress during certain times of the year when demand for services is high.
Is your acne worse during certain times?
In August, Verizon began offering a service that blocks texting during certain times of the day.
But state regulators also said they were unsure why the filters seemed less efficient during certain times of each month.
"My block is already too busy during certain times of the day," she said by phone on Wednesday.
Please note that during certain times of the year many people are eager to speak with an advisor and appointments fill up quickly.
Thirty-three yeago aGayle Rubinubin, a cultural anthropologist and feminist activist, observed that, during certain times in history, humans tended to renegotiate the sexual order.
Under the Clean Air Act, urban areas with the worst smog must sell only cleaner-burning fuel, at least during certain times of the year.
Much like in previous games, some Pokémon only show up during certain times of day, or will evolve to different forms.
"They have made it difficult for us during certain times, but at other times they have helped us," Ms. Moorthy said.
The Gulf of Mexico margin is a well-known and data-rich example of a "supply-dominated" shelf-margin during certain times (e.g., Paleocene).
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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