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The phrase "a primary one is" is correct and usable in written English.
It can be used when identifying or defining something as a primary or main example or category in a discussion.
Example: "In our analysis of the factors affecting climate change, a primary one is the increase in greenhouse gas emissions."
Alternatives: "a main one is" or "a key one is".
Exact(7)
A primary one is jet fuel, essentially kerosene.
Jordan has given more than one reason for returning to the court, but a primary one is "love of the game".
But pictures have desires, too, he argues, and a primary one is the desire to capture our attention — to "transfix the beholder" and gain some measure of mastery or power over us.
Undoubtedly, there are many complex reasons, but a primary one is that they run out of cash.
Of course, there many reasons for the increase in prenuptial agreements, a primary one is an improving financial and real estate market.
A primary one is the inclusion of studies other than RCT's.
Similar(53)
There are several notable experimental differences between the studies which are likely to impact on the final results; a primary one being that we, in contrast to Fan et al., used full-length Sup35 rather than the NM fragment.
According to John Graham, Managing Partner, maintaining this superior level of service at Twin Farm's remote location has its challenge, a primary one being the attraction and retention of talent.
There are several reasons for such a rapid drop-off, but the primary one is a talent drain.
This happens for a few reasons but the primary one is that the toys require too much attention and have no lasting play value.
Roseanna Marshall, who has a degree in drama and theatre art, is worried about a variety of issues, but her primary one is job security.
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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