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Discover LudwigThe phrase 'is its key' is correct and can be used in written English
You can use the phrase when describing the importance of something. For example, "In achieving success, hard work is its key."
Exact(17)
The U.S., it says, is its key market, but it also has a substantial number of posters from Europe who are a "great source of fashion inspiration and diversity," says a spokesperson.
That is its key power.
A change in the law on psychedelic drugs is its key aim, and not merely for their reputed therapeutic purposes.
Laveau, who was hugely influential here in her lifetime but then passed into a long period of obscurity, is its key figure.
"They are strong defenders of the Second Amendment," said Senator Ted Cruz, Republican of Texas, who received donations from the group during his primary campaign and is its key ally in the Senate.
Relentlessly mean-spirited as this piece of the plot is (its key image is a photo secretly taken by the manipulative Lewis, showing the herpes-measled genitalia of a rich patient he is currently exploiting for his high-society connections), its themes do at least seem closer to Wolfe's heart, and they produce some correspondingly livelier passages, particularly in the second half of the book.
Similar(43)
It weakens Merck's position in what was to be its key growth area in the near term".
That's its key".
Whether CleanSpace can persuade enough users to buy into its model will be its key challenge.
The label's jeans and biker jackets are its key looks.
Seemingly, one of the biggest challenges for co-ops may also be its key advantage: its flat ownership structure.
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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