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Discover LudwigThe phrase 'serve as both' is correct and can be used in written English.
The phrase most often appears in the form 'serve as both X and Y', where X and Y are two related concepts. For example: "This book serves as both a reference guide and a source of inspiration."
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The ships serve as both defensive and offensive weapons.
Some ecosystem services serve as both final and intermediate services.
It can also, apparently, serve as both a sleep aid and an aphrodisiac.
Originally, the statue was intended to serve as both monument and lighthouse.
As lovingly filmed as they are made, these creations serve as both therapy and art.
Humans serve as both host and reservoir for Mycobacterium tuberculosis, making tuberculosis a theoretically eradicable disease.
You serve as both Sephora's Chief Marketing Officer and Chief Digital Officer.
For year two, the board hired someone to serve as both teacher and administrator.
Their stories serve as both inspiration and empowerment: If she could, then I can.
Consent decrees also serve as both beacons and touchstones that instigate broad positive change throughout policing.
Polyoxometalates (POMs) were used to serve as both reducing and bridging molecules.
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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