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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.
Profitability and sustainability must go hand in hand—they are not mutually exclusive.
《在广州石围塘检阅滇均的演说》(1924年4月4日)
我越是研究自然,就越对造物主的工作感到惊叹。