Now, what happened was not maybe what you thought, which is, he suddenly became passionate, engaged, involved, got a new teacher, he hit puberty, or whatever it is.
你会听到这个：  其实，发生的情况和人想像的并不一样， 那个孩子并没有突然变得很热爱，投入， 找了新老师，或者突然开窍。