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Discover Ludwig"What's this" is correct and usable in written English
You can use it when you want to ask about something that you don't know or understand. For example, "I found this strange device. What's this?"
Exact(57)
What's this Rebel's cause?
What's this guy's deal?
"What's this?" I asked.
"What's this?" he demanded.
What's this about treasure?
"What's this?" Martin asked.
What's this?" I muttered.
What's this! Binkley thought.
"What's this?" she said.
What's this for?
What's this about?
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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