He who has no homeland is like a nightingale without a green forest.
没有祖国的人,就像夜莺离开了绿林。
没事要戒掉一个“偷”字,有事要戒掉一个“乱”字。
The structure of the international system, not the intentions of individual states, is the primary determinant of state behavior.
——回忆在香港华人西医书院肄业
自动控制的根本问题是在存在干扰的情况下维持期望状态。