俗话说:良好的开端是成功的一半。乐曲家演奏前要定弦,歌唱家演唱时要定调,这一切都是为了让琴声更悠扬,让歌声更优美。教师上课也是这样,可以说一节课就是一次演出,演出中的导入环节就好比乐曲家定音、歌唱家定调,也就是第一幕。如何演好第一幕,如何在第一幕中让你的观众被你的台词所吸引,并产生共鸣?这就需要我们恰当、适度地把握好这一环节, As the saying goes: A good start is half the battle. Before the musicians play, they must set the string. When the singer sings, they must set the tone. All this is to make the melodious sound more melodious and to make the song more beautiful. The same is true of teachers attending classes. It can be said that a lesson is a performance, and the introduction of a performance is like the tune of a musician and the tune of a singer, which is the first act. How to play the first act, how to make your audience attracted by your lines in the first act and resonate with them? This requires us to properly and properly handle this process.