元素可以分为具有相似性质的组。
我存在于天地之间，就如同一枚小石子、一棵小树，存在于大山之间，正以为自身实在渺小，又哪里会自满自负呢！
You’ll get 10x better results by elevating good behavior rather than punishing bad behavior， especially in children and animals.
In the chaos of life, it's the small moments of clarity that keep us going.