Put it in the middle of a reaction edit, after the setup line and before the decision, then follow it with a short Nope for a flat refusal or Okay Let's Go when the hesitation turns into agreement.
關於此聲音
This 12-second clip is one voice holding a long, steady mmm with no words, music or other sounds around it. It feels thoughtful and a little awkward, the kind of sound someone makes while weighing an idea, stalling for time or enjoying something too much to speak. That slow, unhurried hum makes the pause itself feel funny and relatable.