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If all elemental equations are defined for all time, then the system is a continuous-time system.

如果所有的基础方程都定义于整个时间过程，那么，该系统就是连续时间系统。

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If, as in sampling or digital systems, some elemental equations are defined or used only at discrete points in time, a discrete-time system is the result.

而假如，在采样问题或数字系统中常见这种情况，有些基础方程仅定义于，或仅能应用于离散的时间点上，这就导致了离散时间系统。

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Besides the straight action stuff, we also thought it might be fun to put it through another extreme -- though this time an elemental one.

ENGADGET: Veho Muvi HD 'NPNG' Edition action camera impressions (video)

Although the parties likely to assume power doubtless feel threatened by extremism, the post-electoral situation will force them to focus time and energy on more elemental things: reestablishing civilian rule after nearly a decade out of power, reversing many of Musharraf's recent actions, perhaps seeking his ouster, sorting out differences among themselves, and dealing with pent-up public frustrations about lack of services and other grievances.

CNN: Analysis: What if Pakistan's opposition wins?