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引力比其他力弱得多这一事实可能是物理学中最深刻的谜团。
The most important thing in a software system is the architecture.
"Books are mirrors, but they are also windows."
处于逆境,思想要开拓放达,奋发图强;处于顺境,思想要警觉收敛,约束自身。