At the time, people believed that light waves, just as sound waves, ocean waves or shock waves, had to travel through a medium.
当时，人们认为，光波就像声波、海浪波或冲击波一样，它们的运行必须穿过介质。
The researchers also charted sound waves passing through nine quiet regions of the sun, where no sunspots were developing, and found no significant anomalies in the waves' travel time.
在无黑子活动的九个太阳宁静区，研究人员发现声波的传播时间没有这么大的变化。
It takes time for both light and sound to travel.
光和声音的传播都需要时间。
The newly designed shop entrance is crafted as a fascinating installation of light and sound - an emotional and virtual time travel.
新设计的商店入口是有关光线和声音的迷人装置—一场带给人情绪体验的虚拟时间之旅。
If we have used our eyes and ears, we have already realised that sound takes time to travel through the air.
如果我们用过眼睛和耳朵，我们就知道声音在空气中传播是需要时间的。
The relation equations between Normal Mode propagation travel-time and sound-speed fluctuation are used to explain the qualitatively relationship between two spectra.
应用简正波传播时间与声速起伏的对应微扰关系式，给出了上述对应关系的理论解释。
The relation equations between Normal Mode propagation travel-time and sound-speed fluctuation are used to explain the qualitatively relationship between two spectra.
应用简正波传播时间与声速起伏的对应微扰关系式，给出了上述对应关系的理论解释。
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