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。
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。
When all elemental equations can be described by a set of constant parameter values, as in the familiar RLC circuit, the system is said to be stationary or time-invariant or constant coefficient.
当所有基础方程都能用一组定常参数值来描述，正如熟知的RLC电路的情况，就称该系统是稳态的，或时不变的，或常系数的。
If one or more parameters, or the very form of an elemental equation, vary in a known fashion with time, the system is said to be time-varying.
如果有一个或多个参数，甚至连基础方程本身都以一种已知方式随时间而变化，则此系统就称为时变系统。
At the same time, also contains a large number of crops needed for growth in the volume of elemental sulfur.
同时还含有大量作物生长所需要的中量元素硫。
Conventional methods for the elemental analysis of materials often require a contact to the specimen and a time-consuming mechanical sample preparation.
材料中元素的传统分析方法需要接触样品，并通常需要耗时的样品机械制备步骤。
The elemental can have only as many creatures trapped inside the whirlwind at one time as will fit inside it.
空气元素想让多少生物同时被卷进身体就可以卷进多少。
The elemental can have only as many creatures trapped inside the whirlwind at one time as will fit inside it.
空气元素想让多少生物同时被卷进身体就可以卷进多少。
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