前不久的一堂音乐课上,一向唱歌动听的小亮竟然唱跑了调,弄得小亮好不懊恼。他不明白,本来很嘹亮的嗓子怎么会变得又闷又憋。体育委员小东也遇到类似的事,平时喊操喊得好好的,这两天却突然喊不出来了,只好叫别人代劳。其实在青春期,许多青少年朋友都会有这样的“遭遇”。那为什么会发生这样的变化呢?儿童 Not long ago in a music class, has always sing and listen to the small light actually sang tune, made little light good not annoyed. He did not understand how the originally loud voice became boring and bored. Sports Commission Xiaodong also encountered a similar thing, usually call shouting shouting well, these two days suddenly could not shout, had to ask others to do the work. In fact, in adolescence, many young friends will have such “encounters.” Why did such a change happen? Children