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Discover LudwigThe phrase "are penetration" is not correct in English and does not convey a clear meaning.
It may be intended to describe a state or action related to penetration, but it lacks proper grammatical structure.
Example: "The results of the study indicate that there are penetration issues in the current design."
Alternatives: "there is penetration" or "penetration exists".
Dictionary
Exact(1)
To date, the two best characterized limiting stages for development of PMs are penetration of epidermal cells [ 20, 55] and development of haustoria [ 56, 57].
Similar(59)
It's penetration that bothers them".
What really distressed her was penetration of a different kind.
What his team really lacked was penetration in attacking areas.
There will be penetration of organizations likely to be places where plots are supported.
She is the pouting coquette who once said her favourite quality in a man was "penetration".
As with "Hadrian," it is penetration — historical, moral — and the subject, again, is often time.
And there had been "penetration" of the government — "so there are some parallels".
Though, for it to count as a one-night stand, is penetration required?
The only thing he knows is penetration and thrusting, to orgasm, under the covers with the lights out.
When I watch movies, eroticism sort of ends when there's penetration.
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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