Whereas chemical rockets waste too much propellant to reach a net change in spacecraft velocity, electric thrusters can do exactly the same mission using just a small fraction of the propellant.

鉴于化学燃料火箭浪费太多的推进剂难以实现飞船速度的静变化，电力推进器仅仅使用一小点推进剂就可以做同样的任务。

VB's mission statement is to be the most productive tool for building .NET-connected applications.

VB的主要使命就是成为编.net相关应用程序最有效的工具。

NET Framework, implements many function Modules, such as Archive management, Mail transmission, Schedule management, Important mission management, public information management, system management etc.

NET框架技术，实现了文档管理、邮件传送、日程管理、重点工作管理、公共信息管理、系统管理等功能。