If you have a two, three or four year old you know, no speech, no social interaction, Don't wait, you need at least 20 hours a week of one-to-one teaching.
假如是两到四岁的话 并且他们不会讲话不会与人打交道 那我认为必须每周花20个小时进行一对一的训练 这点是决定必要的