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Let me tell you something about Hew-mons
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Star Trek memes and shitposts
Come on'n get your jamaharon on! There are no real rules—just don't break the weather control network.
They can't speak English though. In fact the scene this screenshot is from is them trapped in the past unable to communicate because their universal translators are offline. I would assume Quark speaks Federation Standard, but apparently that's not close enough to English to figure out what they're saying in the 40s
Quark would never lower himself to speaking anything human. He views humans and the Federation as inferior and foolish.
Understanding a customer as famously wily as the Federation through language would be a business advantage. We know this because it works today.