世界上充满了自童年起就再未以开放心灵面对开放门户的人。
最好的保护策略是将经济激励与生态效益结合起来。
The essence of mathematics lies in its power to reveal patterns and symmetries.
"There is always one moment in childhood when the door opens and lets the future in."
If you want to be happy, be.
确保和平的最佳方式是维持主要国家之间的权力平衡。