光和声音的传播都需要时间。
空气是声音的传播媒介。
比如，顶棚上安装吸音板就有助于减少声音的传播。
For example, acoustical tile on a ceiling serves to reduce the propagation of sound.
本书为小读者们介绍了声音的来源、声音的传播方式，以及声音与距离之间的关系。
Sound and Music introduces young readers to a wide range of sounds and their sources, and to how sound travels.
韧质材质的PV B膜对声波有很好的阻尼作用，使夹胶玻璃能有效阻挡声音的传播，明显的降低外界环境噪音。
Tough PVB film can well damp sound waves and enable insulated glass effectively hinder sound transmission and definitely lower environmental noise.
当声音在水中传播时，奇怪的事情会发生。
When sound travels through water, strange things can happen.
这些高频声音传播得没有那么远，因此可能更好地隐藏了发出这些声音的个体，它们在自己的地面巢穴中特别容易受到捕食者的攻击。
These higher-frequency sounds do not travel as far, and so may better conceal the individuals producing them, who are especially vulnerable to predators in their ground nests.
正是由于这种集声，即使是海洋中相对微弱的声音，尤其是低频声音，也能传播数千英里。
This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles.
但这些音乐厅的内墙都有很多装饰，很多水泥装饰物，比如雕像，这些装饰物能有效传播声音，从不同方向反射声音。
But they all have a lot of decorations on the walls inside, lots of ornamental plasterwork like statues, which distribute sound very efficiently, reflecting it in all different directions.
初步探讨了人工饲养条件下白鱀豚声音传播与环境适应的关系。
The relationship between sound transmission and environmental adaptation of Lipotes vexillifer in captivity was preliminarily studied.
在实验中，我们发现声音以不同的速度通过不同的物质而传播。
In experimenting we find out that sound travels with different velocities through different substances.
再者，苹果赋予编辑声音及影像的能力，且能够修改及制作影音内容，使每个人都有潜质成为传播人。
Add to that capacity what Apple brought to editing voice and video, and the ability to edit and produce audio and audiovisual content, and everyone is a potential telecaster.
在1961年，美国制造商Convair生产出了可以达到0.91马赫的商用喷气式飞机，速度相当于声音传播速度91%。
In 1961, American manufacturer Convair released a commercial jet that could reach Mach 0.91, meaning 91 percent as fast as sound.
但是现在电脑可以不受形式的限制做到这一切，一旦被转化成数字格式，信息就可以通过声音或是触碰进行传播。
But now the computer has essentially done away with the limits of form, because information, once it has been digitized, can be conveyed through sound or touch.
利用声学原理探测中微子的一个优势就是：与光相比，声音在水或冰中更容易传播。
One advantage of acoustic detection is that sound travels rather better in water and ice than light does.
从希腊到文艺复兴时期，对流体理论的理解，包括声音是如何通过流体传播的，并没有多大的进展。
The understanding of the theory of fluids including sound propagation through them made little progress from the Greeks to the Renaissance.
惩罚可能使人不愉快，但是它为特定的宗教团体提供更大的好处，使他们能够壮大并传播他们的声音，”他说。
The punishing may be unpleasant but it's in the service of the greater good for that particular group or religion, enabling them to thrive and spread the word, " he says.
他的声音当时是有影响力的，广泛传播且被重视的，尤其在他到了美国之后。
His was now a powerful voice, widely heard, always attended to, especially after he moved to the U.S..
用影像和声音传播的新闻是唯一真正有发展前途的新的新闻形式。
The journalism of sight and sound is the only truly new form of journalism to come along.
虽然声音仅能传播及英里，但聚拢起来还是能被一些个体听到的。
Although sounds travel only a few miles, it is possible that some individuals get close enough to be heard.
有确凿证据表明当时的表演者们戴着装有小型扩音器的面具，以辅助声音的方向性传播。
There is strong evidence that the actors wore masks that were fitted out with small megaphones to assist in increasing the directivity of the voices.
人群似乎充满了整个城镇，省市的声音也在空气中传播。
The crowd seemed to fill the entire town and the sound of hymns rose into the air.
他们可能意识到声音是通过空气传播的波，并可能有声音传播时空气压缩的概念。
They probably realized that sound was a wave propagating through the air and may have had a notion of the compressibility of air during sound propagation.
这个研究组已经发现，和这种会唱歌的老鼠一起长大的普通老鼠，能够发出几个与一般鼠的叫声不同的声音，这证明了“唱歌”这种交流方式在小组范围内是可以传播的，就好像方言一样。
The team has found that ordinary mice that grew up with singing mice emitted fewer ultrasounds than others, which could indicate that communication methods can spread in the same group like a dialect.
他的声音必须广为传播。
搜狐ceo张朝阳觉得这样的声音是官方的姿态，我们有没有生产罪恶，只是传播它而已。
Sohu CEO Zhang says such an argument "is the official line. They're not conducting evil, just spreading it."
顺着风向呼喊，并不是声音传播的速度变快了，但是人们听到的声音却更清楚。
He who calls out downwind, can be heard more clearly, yet sound is not travelling any faster.
声音在空气中以每秒340米的速度传播。
在这一点上，也许你们应该建立能代替自己声音，并将这些信息传播到世界各地的媒介平台。
At this point, maybe you guys should develop a media platform which can stand for your voices and deliver messages to all around the world.
在这一点上，也许你们应该建立能代替自己声音，并将这些信息传播到世界各地的媒介平台。
At this point, maybe you guys should develop a media platform which can stand for your voices and deliver messages to all around the world.
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