How can you tell which direction? By day, look for the Sun. It is in the east in the morning and the west in the afternoon. At night, use the Big Dipper to help you find the North Star. It would be better to bring a compass because its needle always points north.
How do you know how far you have gone? You could count every step. Each step is about two feet. You’d better wear a pedometer which is a tool that counts steps. If you know where you started, which direction you are heading, and how far you have gone, you can use a good map to figure out exactly where you are.
Today there is a new way for travelers to figure out where they are. It is the GPS. It has 24 satellites that orbit the earth and constantly broadcast their positions. Someday you may carry a small receiver as you hike and use GPS to find out if you are there yet! (167 words)
Useful Words and Expressions:
compsiss n.罗盘，指南针，圆规 v．包围
We're heading home.我们正朝着家走。
Where are you heading for？你往哪儿去？
You’re heading for an accident if you drink and drive．如果你酒后开车，势必会发生车祸。
Who headed the department？谁主管着这个部门？
His name heads the list for the candidates．他是候选人名单上的第一名。
Tom headed the ball into his own goal．汤姆把球顶进了自己的球门。
figure out v.．合计为，计算出
GPS abbr. Global Position System全球定位系统
orbit n．轨道 vt．绕……轨道而行