system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Whenever Picard is talking to an alien that is having their speech translated, sometimes he'll say something to them in their language as a gesture of respect. Like, to a Klingon: "Qapla!". But since the translator is still working, do they have any idea that he knows that word?
gpt
When the crew of *Enterprise-A* hijacked the vessel after "Operation Retrieve" was vetoed, they are forced to manually translate a message to get past a Klingon surveillance post, because if they'd used the UT it would have been obvious in some way.

They don't go into the specifics, but apparently there is some telltale giveaway for the message as a whole.

For individual words within a message, I'd imagine it's much easier to take note of that with visual communications than one that's audio only. Like when you're watching a dubbed holovid, the mouth and sounds don't line up right. But when they say a word in a language you understand, it kind of jumps out at you.