In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.

Q: She had been trying to narrow down a new definition , mathematically stated , of quantum probability .

A: Original
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Q: What a waste of time it will have been , if the egg has already hatched . "

A: Original
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Q: " When you touch me , I feel like my skin is on fire and only you can quench me . "

A:
Original
****