数学中的合作是必不可少的；没有人能独自解决所有问题。
Collaboration in mathematics is essential; no one can solve all the problems alone.
食品体系必须发展以满足不断增长的人口需求。
数字技术不会扼杀造纸业，自满才会。
Rebuilding my career at fifty wasn’t easy—but nothing worthwhile ever is.
It is by no means an irrational fancy that， in a future existence， we shall look upon what we think our present existence， as a dream.