Is this argument deductive or inductive? When I stop at a traffic light, I hear this funny, rattling sound coming from under my car. It is sort of in the middle or maybe toward the back, but definitely not toward the front. I only hear it when the car is idling, not when I’m driving along at a reasonable speed. My Dad said once that the metal baffles (消音器隔板) inside a muffler (排气管消音器) can loosen up if the muffler is old and rusty. He said that a loose baffle makes a rattling sound when it vibrates, like when the engine is idling or when the tires are out of alignment. My muffler is at least nine years old. So, I’m thinking that probably the rattling sound is coming from the muffler.