GPS允许持有对应设备的用户来确定精确的时间、速度、经纬度以及海拔，而误差只有几米。
The Global Positioning System enables properly equipped users to determine precise time and velocity and worldwide latitude, longitude and altitude to within a few meters.
航天器的重量和轨道不同，所需火箭提供的能量和速度也各不相同，各种轨道与速度之间有一定的对应关系。
And the weight of the spacecraft orbit, the rocket needed to provide energy and speed varies, with a variety of track between the speed of a certain relationship.
例如，使用快照，在需要修改多个配置文件或对应用程序执行升级时，我可以加快备份和恢复速度(如果需要)。
For example, using snapshots, I can speed up the backup and (if necessary) the recovery times when I need to modify a number of configuration files or perform an upgrade of an application.
应用推荐