vibration同oscillation有咩分別

The difference between the two terms is not distinct. "Oscillation" is a more generic term that refer to repeated to-and-fro motions or the like with a regular period. "Vibration" is commonly applied to mechanical systems, with regular or irregualar periods.

Hence, we would say the a guitar string vibrates (though oscillate could be used). But we would only say the oscillation of electric and magnetic fields in the electromagentic waves.

You may refer to the following web-page for more information:

http://www.ammas.com/topics/Physics/a143057.html