1)这个是最主要也是最常发生的原因之一.
This is one of the most important reasons that also happens most frequently.
2）他们的压力大,时常心情不好发泄在孩子身上
They are under a lot of pressure,whenever they feel down,they often take it out on the kids.
3）他们对孩子的期望值高,当孩子不能满足他们的期望时,他们会采取打孩子来发泄
They have too high of expectation for the kids,when the kids can not meet their expectation,they will release the anger through physical punishment.