"I don't feel he's gone yet - I still feel he'll be back soon," she tells us. "In my mind, he's in his school uniform. He'll return, swinging his bag."
优点： 输出均值更接近 0，梯度更稳定。
，这一点在safew官方下载中也有详细论述
I tried to solve it somewhat elegantly:
About half of all churches in England have bats in them