全球性挑战需要全球性思维和本地化行动。
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.
The beauty of mathematics lies in its simplicity and depth.
事实上,我不知道我的想法从何而来。我所知道的是,当我不刻意去想它们时,它们就会出现。