挺不容易的. 试一试:
Of course, we know that for most of history, this concept of "just war"
was rarely observed. The capacity of human beings to think up new
ways to kill one another proved inexhaustible, as did our capacity to
exempt from mercy those who look different or pray to a different God.
当然, 我们都知道, 从大部分史实来看, 这种"正义战争" 的概念鲜有所见. 人类刻意发明日新月异的互相残杀的方式的能力已经被见证为没有止境. 同样被见证为没有止境的是我们豁免自己给予那些外貌不同或信仰不同的人怜惜的能力.