Übersetzung von "Echtzeitstrategie" ins Englische. Wird das Real-time strategy oder real time strategy geschrieben? Oder doch anders?

Translate "Echtzeitstrategie" (German) into English. I think its real-time strategy. But do you use the hyphen or write it as one word, three separate words? How is it correct?

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Absolutely correct. The hyphen shows that “real“ and “time“ are intended to be a single adjective modifying the noun that follows them. We call this a “compound adjective.“

“Real time strategy” would be ambiguous. Without the hyphen, we’ll expect the next word to be a noun. So we’ll try to figure out what a “time strategy“ is. Since there is no well-known phrase “time strategy,“ it becomes confusing.

“Realtime strategy”: “realtime“ isn’t an accepted word. (I’ve seen it used in a couple of science fiction novels, but it doesn’t mean what you mean here.)