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Free sign upThe word 'unsubstitutable' is not a correct word in written English.
You would instead use the word 'irreplaceable' which means impossible to replace or substitute. Example sentence: That painting is an irreplaceable piece of artwork.
Dictionary
unsubstitutable
adjective
Not substitutable.
Exact(1)
The key concept: P is unsubstitutable in agriculture and in human life".
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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