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城市的穷人就像树的根:看不见,但对生存至关重要。
The city's poor are like the roots of a tree: unseen, but essential to its survival.
你不能靠理论来经营企业或任何东西。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
不要为变老而遗憾。这是许多人求之不得的特权。