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"Nothing is too high for a man to reach, but he must climb with care and confidence."

The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.

成功的關鍵是在生活的各個方面不斷成長——精神、情感、靈性以及身體。

數學之美在于它能夠將復雜的事物簡化。