Why is it necessary to demonstrate in front of the children to do the demonstration of "mirror demonstration"? Because young children's spatial orientation perception level is low, the specific development trend is: three-year-old children can identify up and down orientation, four-year-old children can identify the front and back orientation, five-year-old children began to identify the left and right orientation of their own center, but identify the other side of the left and right is more difficult, generally to seven or eight years of age to master. Therefore, when the teacher demonstrates to the children, he/she should do a "mirror demonstration", for example, to ask the child standing opposite to him/her to raise his/her right hand, and the teacher himself/herself should raise his/her left hand; or he/she should illustrate with concrete things, for example, to say, "Stretch out the hand that is holding the spoon". Do not say "left and right" to avoid confusion.