Place it at the end of a failed attempt, just before the reaction shot, then follow it with an awkward pause sound to let the failure sink in. For a bigger collapse, add a disappointed reaction after it, letting each beat land before the next clip starts.
關於此聲音
This is a very short spoken line, lasting under two seconds, delivered in a flat, matter-of-fact tone. It lands as a dry, resigned refusal, the sound of someone shutting down an idea without raising their voice. The humour comes from how calm and final it feels, making it easy to recognise as a quick no in conversation.