All sounds travel to our ears in about the same way and come to us in waves that can be seen only with special electronic equipment. 所有的声音都以大约相同的方式传到我们的耳朵，传给我们的声波只能用特殊的电子设备才能显现。
Sound travels through the medium of air. 声音通过空气这一媒介传播。
How much does sound travel faster in water than in air? 声音在水中比在空气中传播快多少？
