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Sentence: This key difference between the two species is crucial to understanding their evolutionary relationship.
Yes, the phrase "this key difference" is correct and commonly used in written English. It can be used whenever discussing a notable difference between two things or concepts. Example: This key difference in their approaches to problem-solving is what sets them apart as leaders in their field.
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This key difference from other kinds of ownership structures prevents large investors from taking over.
This key difference is the reason for the memorable phrase "sedges have edges, but grasses have knees". Sedges reproduce by underground tubers and rhizomes.
As they were growing up in the 1920s and 30s, both would have had good long-distance views of their respective burgeoning metropolitan centres, with this key difference: until the late 60s, Wren's St Paul's Cathedral remained far and away the most salient building on the London skyline: a baroque salver cover beneath which lay church and state disjointed.
This key difference in orientation appears to derive from a sequence insertion in D-DT that topologically limits binding to only one CD74 molecule per D-DT homotrimer, in contrast to predicted binding of up to three CD74 molecules per MIF homotrimer.
And this key difference could potentially give Facebook a tremendous advantage in search when it eventually decides to move in that direction.
Apart from this key difference, however, the neo-Fregeans hew in other places quite closely to Frege's overall deductive strategy when deriving the Dedekind Peano postulates.
Similar(42)
Perhaps this the key difference between the situation in the U.S., on one hand, and old Europe on the other".
Something – and this is the key difference – actually useful.
"This is the key difference between a marriage and other unions".
This is the key difference in outcome thinking.
This is the key difference to hyperaccumulating plants.
More suggestions(16)
this substantial difference
this significant difference
this fundamental difference
this critical difference
this important difference
this key advantage
this key aspect
this key feature
this key knowledge
this key appointment
this key element
this key fact
this key book
this key component
this key control
this key idea
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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