那天我和在外地出差的爸爸打电话的时候,居然听到了回音,电话里为什么会出现回音呢?A:回音是声音被反弹回来后我们听到的声音,如果我们对着山谷大声喊叫,就会听到回音。打电话时,我们的声音被转换成电波传输到电话的另一头,这些电波信号会有一部分被反馈回来,而反馈回来的声音会有一定的延迟,于是你就 When I was on the phone with my father on a business trip that day, I actually heard an echo. Why was there an echo on the phone? A: Echo is the sound we heard after the sound was bounced back. If we shout at the valley You hear an echo. When you make a call, our voice is converted into radio waves and transmitted to the other end of the phone. Some of these radio signals are fed back, and the feedback voice will have a certain delay, so you