A philosophical problem has the form: "I don't know my way about."
"If you want to fly, you have to give up what weighs you down."
真正的力量来自于内心的平静。
Be the change you wish to see in the world.
及时采撷你的花蕾，旧时光一去不回，今天尚在微笑的花朵，明日便在风中枯萎。
Disaster relief architecture must be simple enough for victims to build themselves.
The security dilemma is a fundamental feature of international politics, as states' efforts to increase their own security often decrease the security of others.
