Place it just after the reveal or mistake at the centre of a short edit, then follow it with Dun Dun Dun for a heavier beat or SpongeBob Fail when the moment stays comic. Keep it as the reaction that closes the scene, not the opening.
关于此声音
This clip is a single human sigh, a slow audible breath out with no words attached. It carries a plain sense of weariness and quiet frustration, the kind that follows a setback, a long day or an answer that changes nothing. The sound feels resigned rather than angry, making the disappointment land softly without needing an explanation.