求翻译：上图最里层为总体出行次数分布，中间层为没有自行车的出行次数分布，外层为有自行车的出行次数分布。由图中可以看出出行者出行次数集中在一周1~2次；有自行车的同学一周中出行的次数比较多，而无自行车的人一周中出行的次数相对较少。可见，自行车的拥有与否对一周中同学的出行次数具有重要影响。是什么意思？

The figure the innermost layer of the distribution of the overall trip times, the distribution of the middle layer of the bicycle trip times, the outer layer of the distribution for a bike trip times. It can be seen by travel trip times concentrated in one week 1 to 2 times; more the number of stude

On the level of the overall travel distribution, the middle tier is not bicycle travel distribution, with a bicycle travel distribution. You can see in the figure by traveling travel on a 1 to 2 weeks; the students have a bicycle in a week of travel times, and no more than a week of bike commuters i

On the chart most in level for the overall journey number of times distribution, the intermediate level for does not have the bicycle journey number of times distribution, the outer layer for to have the bicycle journey number of times distribution.May see the traveler by the chart in to go on a jou

Innermost as overall travel times on distribution, the middle layer is the number without bikes travel distribution, outer layer for the number of bicycle travel distribution. Centrally by the figure can be seen in the number of travelers travel 1~2 times a week; students have bikes more travel than