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"When you love what you do, you don't see it as work."

A mathematician is a device for turning coffee into theorems.

The United States, in their expansive capacity, are capable of containing within their limits the whole population of the earth.

釋義：天之險在于高不可升，地之險在于山川丘陵。王公設(shè)險以保衛(wèi)國家，險的功用非常大。