How can you tell which direction? By day, look for the Sun. _____________________________________________. 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? ____________________________. 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 ________________________. Someday you may carry a small receiver as you hike and use GPS to find out if you are there yet!
Useful Words and Expressions:
dipper 北斗七星
compass 罗盘
pedometer 步数计
GPS= Global Position System 全球定位系统
orbit 轨道，绕……轨道而行
receiver 接收器
本帖隐藏的内容需要回复才可以浏览
作者: herman_liu76 时间: 2014-11-20 22:13
it 's in the east in the morning and west in the afternoon. at night, use the big dipper help you to find the north star.it will be better to bring a compass because it's needle always point the north.
you could count every step.
constantly broadcast the positions作者: susan.sui 时间: 2014-11-25 17:18
it is in the east in the morning and west in the afternoon
you could count every step
constantly broadcast their positions作者: laura6688 时间: 2014-12-10 09:45
it is in the east in the morning and west in the afternoon
you could count every step
constantly broadcast their positions
