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实现明天的唯一限制是我们今天的疑虑。
The only limit to our realization of tomorrow will be our doubts of today.
"The world is full of small things that are big enough to break your heart."
Words are, of course, the most powerful drug used by mankind.
可持续发展不是一种选择;它是我们对后代的责任。
The study of heuristics reveals how we simplify complex problems, sometimes leading to errors.