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Man is condemned to be free.
采石场应当在开采的同时治愈大地。
释义:全心全意的人们常得人爱,而态度冷淡者往往遭人嫌弃。
The only way to change behavior is through manipulation of reinforcement contingencies.
"To live is the rarest thing in the world. Most people exist, that is all."