學(xué)習(xí)數(shù)學(xué)的唯一方法就是做數(shù)學(xué)。
The degree of slowness is directly proportional to the intensity of memory; the degree of speed is directly proportional to the intensity of forgetting.
挑戰(zhàn)不在于代表非洲,而在于呈現(xiàn)非洲的復(fù)雜性。