1. A wave length (the horizontal distance between two wave crests),
    波长（两个浪峰间的水平距离）

2. During that time she covered a distance of eight miles.
    在那段时间里，她游了8英里。

3. As a reasonable guess, they might, on an average, be 100 light years away.(A light year is the distance which light travels at 186,000 miles per second in one year, namely 6 million million miles.)
    据合理推算，外星人离我们平均距离也有100光年之远（1光年是光以每秒186，000英里的速度在一年内走的距离，即6万亿英里）。

4. Modern means of communication have enabled the travellers to reserve a plane seat or a hotel room from a long distance.
    现代通信手段使得游客可以从遥远的地方预定机座和旅馆房间。

5. (An estimated 15 percent of male long distance runners have low iron stores.)
    （估计有15%的男性长跑运动员铁离子储量低。）

6. One hour and seventeen minutes passed and we had not even covered half the distance.
    1小时17分过去了，走了还不到一半路程。

7. I heard a blast of the whistle in the distance.
    我听到远处一阵口哨声。

8. With the spire of the church of our village showing in the far distance.
    还可远远望见老家村子里的教堂的尖顶。

9. From the shore line, out to a distance which may be anywhere from a few miles to a few hundred miles, runs the gentle slope of the continental shelf, geologically part of the continents.
    从海岸线向大海延伸几英里到几百英里的区域是大陆架慢坡，从地质学上来说，它是大陆的一部分。