GDOP

例句：

1. 1. The GPS device is very useful for navigation.
   GPS设备对于导航非常有用。
2. 2. The guide dog helped the blind person find his way home safely.
   导盲犬帮助了盲人安全地找到回家的路。
3. 3. The gdp growth rate has been declining over the past decade.
   过去十年，gdp增长率一直在下降。