实现明天理想的唯一障碍是今天的疑虑。
The only limit to our realization of tomorrow will be our doubts of today.
在为增加粮食生产的机构和为控制人口的机构联合起来共同努力之前，抗击饥饿的斗争不可能取得永久性进展。
The future of energy lies in balancing immediate needs with long-term environmental goals.
The founders of a new colony, whatever Utopia of human virtue and happiness they might originally project, have invariably recognized it among their earliest practical necessities to allot a portion of the virgin soil as a cemetery, and another portion as the site of a prison.
世界充满了神奇的事物，耐心地等待我们的感官变得更加敏锐。