传播器是利用磁石安装到我的脑袋里的，就在耳朵后面。
The transmitters are stuck to my head, behind my ears, using magnets.
甚至用一种纯洁的声音传播的远远的，LRAD通过聚集的声音柱将声音传到远方的耳朵里。
Rather than using pure volume to throw sound far, the LRAD reaches distant ears by focusing the audio beam.
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。
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。
If we have used our eyes and ears, we have already realised that sound takes time to travel through the air.
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