Strange Horse Legs
奇怪的马腿
A horse travels a certain distance each day. Strangely enough, two of its legs travel 30 miles each day and the other two legs travel nearly 31 miles. It would seem that two of the horse's legs must be one mile ahead of the other two legs, but of course this can't be true. Since the horse is normal, how is this situation possible?
一匹马每天都要走一定的距离。更为奇怪的是，它有两条腿每天走30英里，另外两条腿走将近31英里。这看起来马的两只腿要必须在另外两只腿的前面一英里，显然这是不可能的。既然马是正常，那这种情况是怎么可能发生的呢？
Answer
答案
The horse operates the mill and travels in a circular clockwise direction. The two outside legs will travel a greater distance than the inside ones.
马在拉磨，顺时针方向绕圈行进。外侧的两条腿就比内侧的两条腿走过更远的距离。
