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Every mathematical problem has a solution; it's just a matter of finding the right perspective.
农民是最早的环保主义者;我们必须支持他们发挥这一关键作用。
真相不在光明中,而在我们不敢探索的阴影里。
No one likes being alone. We just don't want to make friends reluctantly. If we did that, we'd probably just be disappointed.
The only way to change behavior is through manipulation of reinforcement contingencies.