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。
There can be no permanent progress in the battle against hunger until the agencies that fight for increased food production and those that fight for population control unite in a common effort.
写作是一种乐观的行为。
The world owes all its onward impulses to men ill at ease; the happy man inevitably confines himself within ancient limits.
Life is a series of choices.
教学不是传递知识，而是为知识的产生或构建创造可能性。
