EN: Sound energy is energy carried by vibrations (mechanical waves) traveling through matter. - Sound requires a medium (air, water, solids) and cannot travel through a vacuum. - When absorbed, sound energy often transforms into thermal energy.

中文：声能是由振动产生并通过介质传播的机械波所携带的能量。 - 声音需要介质（空气/水/固体），真空中不能传播。 - 被吸收后通常转化为热能。