Average one out of ten travelers is killed or robbed by bandits on the road. 平均起来，十名旅行者当中就有一名被路上的强盗打劫杀害。
A statistician can have his head in an oven and his feet in ice, and he will say that on the average he feels fine. 一个统计学家能把头在伸进火炉里，脚放在冰里，他会说平均起来他感觉好极了。
