https://t.co/TxO0NJNpMB
If people say someone feels "pain", they mean that the person experiences physical suffering or discomfort.
E.g. "He felt a sharp pain in his leg after the fall."
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https://t.co/kjmoaJ9WY1
If people say something is "unknown", they mean that it is not known, identified, or understood.
E.g. "The cause of the strange sound remained unknown."
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