他们用英语怎么说

"They" would say, "They wrote a 500-word article."

If you want the full sentence in English asking how to say something in English, it would be:

"How do they say '他们用英语怎么说' in English?"

The English translation for "他们用英语怎么说" is "How do they say it in English?" or more literally, "How do they say it using English?"

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