The dispersion is due to the inhomogeneity of medium, which will lead the energy of sound to deviate from its direction of propagation.

另一部分则是由于声波在不均匀介质中的声散射把能量散射到其他方向，而使原来传播方向上的声波能量减弱。

youdao

They provide us with the environmentally sound renewable resource of wood, fuel for energy and many non-wood products, including food, fodder, medicines, building materials and cosmetics.

它们为我们提供环保型可再生木材资源、燃料能源和众多非木材产品，包括食物、饲料、药材、建筑材料和装饰材料。

youdao

It could speed the transfer of appropriate energy technology to poor countries and give them objective advice on an optimal energy mix that is safe, secure and environmentally sound.

它能够促进合适的能源技术在穷国的普及，就安全、可靠、具有环境友好特点的最优能源组合为穷国提供客观建议。

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Making a guitar with a solid body permitted the sound of the strings to last longer because their vibrating energy was not weakened by a vibrating sound box.

VOA: special.2009.09.27

The hum of the spinning blades is the sound of China going green as it seeks to address the growing energy demands of its rapidly modernizing consumer society and fast-paced industrialization.

VOA: standard.2010.08.03

"It's the energy of the sound, " Vicentin said.

CNN: Iron Maiden to rock Brazil ... again

At the end of the day, no amount of fiddling with the SPR can replace sound energy policy.

FORBES: Is The White House The New Federal Reserve Of Oil?

The U.S. now has over 2, 000, 000 miles of energy pipelines, which are the safest, most efficient and most environmentally-sound way of moving energy from place to place.

FORBES: Obama's War On Drilling: Oil Surplus, Not Scarcity, Is The New Regulatory Excuse