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The way positive reinforcement is carried out is more important than the amount.
当最后一棵树被砍倒,最后一美元将失去意义。
过去从未死去。它甚至还未过去。
关于可持续海鲜选择的教育使消费者能够推动积极的变革。
Reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them.
描述了盗墓四大门派(发丘、摸金、搬山、卸岭)各自的特点和工具。