使人们解脱了时间、空间及手艺的约束，完成多个对象间的直接交流。
Make it out of time, space and technology constraints, implementation among multiple objects communicate directly.
针对双基站卫星星座的特点，分析了卫星和空间站之间的可视窗、通讯窗和过顶时间要求下的通讯约束。
Visualization window, communication window and communication constraint satisfied over-time between satellites and space station were presented according to the characters of two-station-system.
该模型不仅能够充分表达基于时间和空间的审计策略，还可以根据约束机制对系统用户行为进行实时监控。
The model could fully express audit policies based on time and space constraints, and monitor users' activities real-timely by using constraints mechanism.
采用网络考试，学习者可以突破传统教育资源和教育方法的限制，不受时间和空间等条件的约束。
Using the network test mode, the students may break through the limitation of traditional education resources and education method without the restraint of time and space.
采用培训系统，学习者可以突破传统教育资源和教育方法的限制，不受时间和空间等条件的约束。
Via the training network, students can break through the limitation of traditional education resources and the education method.
采用培训系统，学习者可以突破传统教育资源和教育方法的限制，不受时间和空间等条件的约束。
Via the training network, students can break through the limitation of traditional education resources and the education method.
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