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How sound travels?
Sound waves are vibrating(振动)，They are longitudinal(纵向) waves and vibrations are backwards and forwards.
How light travels?
Light travels away from the source as a wave of energy.
What is Refraction?
Refraction is the bending of light when it travels from one substance to another.
What is Reflection?
Reflection is when light bounces(弹回) off a surface.