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In Chinese, the structure 动词(+宾语1)+就+动词(+宾语1),别⋯⋯ is used to express a casual or straightforward action followed by a suggestion or warning not to do something.
走就走,别用这个威胁我!
Translation: "If you're going to leave, then just go; don't use this to threaten me!"
Here, the speaker is saying that if the other person is going to leave, they should do so without resorting to threats.
说几句就说几句,别太在意。
Translation: "If you're going to say a few words, then just say a few; don't take it too seriously."
In this case, the speaker is encouraging the listener to speak freely without worrying too much about the content.
This structure is useful for conveying a sense of urgency or simplicity in actions while simultaneously advising against certain behaviors.