小朋友们经常打电话,但是你们知道电话的原理吗?你知道电话是怎么传声的吗?听了顿顿猫和斯坦鼠打电话,你可能就明白了。哦!原来,声音是这样传递的。一天,顿顿猫和斯坦鼠在家里做电话机玩。他们准备了两个纸杯、一团棉线、一把锥子。然后分工合作,顿顿猫用锥子分别在两个纸杯的底部中央扎一个小孔,斯坦鼠将棉线的两端分别插进两个小孔,并在杯子里面打结。不大一 Children often make phone calls, but do you know the principle of the phone? Do you know how the phone is talking? You may understand it after listening to the Donun cat and the mouse. Oh! It turned out that the voice is delivered like this. One day, Donton cat and Stan mouse at home to do phone play. They prepared two cups, a ball of cotton, an awl. Then the division of labor, Donton cat with awn respectively in the bottom of the two paper cups tie a hole in the bottom, the two sides of the stanchion cotton thread were inserted into the hole, and knotted inside the cup. Not freshman