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.

[EX Q]: His lips were still moist , conveying a message of seduction even when they were silent .
[EX A]: Original

[EX Q]: But that doesn 't explain the imprint of the wreckage .
[EX A]: Changed

[EX Q]: Marius stared at the dead fish in the murky underworld of ice in the bottom of the tank .
[EX A]:
Changed