适应性是在不断变化的行业中生存的关键。
在人类社会的初期,每个人都是自私自利的。
The mark of mediocrity is to look for precedent.
The anarchic nature of the international system forces states to compete for power.
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.