Mathematical reasoning may be regarded rather schematically as the exercise of a combination of two faculties, which we may call intuition and ingenuity.
数学推理可以相当系统地看作是两种能力的结合运用,我们可以称之为直觉和独创性。
She was still too young to know that life never gives anything for nothing, and that a price is always exacted for what fate bestows.
可持续性不是一种选择,而是我们海洋和地球生存的必要条件。
历史学家是向后看的先知。