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40%的解决方案:提升幸福的能力在我们的个人掌控之中。
The 40% solution: The capacity to increase happiness is within our personal control.
The great powers are always searching for opportunities to gain power at the expense of their rivals, which makes them inherently aggressive.
No nation can prosper without cooperation between its farmers and its industrial workers.
变化是不可避免的,但成长是可选的。