对距离的理解，或者说对查询的输出行为的理解，对于为不同查询选择最有效的选项是至关重要的。
Understanding the distance, or the queries' output behavior, is crucial in determining the most effective option for the individual query.
选择乘车出行的人增多对环境也有一定的好处。
Growth in passengers choosing to take the bus has also had an environmental impact.
赵：我喜欢独自出行。对孤身一人的旅行者来说，最大的优点是自由。我完全可以随心所欲地选择旅行线路，规划行程安排。
I prefer by myself. For the single traveler, the greatest advantage is freedom . I am perfectly free to choose my plan and schedules.
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