可持续性始于土壤;如果我们不关心它,其他一切都无关紧要。
Theorems are the milestones of mathematics.
世界上充满了自童年以来从未以开放的心态面对开放门户的人。
The world is a puzzle, and we are the missing pieces.
"Every book is a mirror, and every reader sees a different reflection."