A time keeping system consists of atomic clock assembly, measuring and comparing system and computation of atomic time scale, etc.
守时系统是一种需要连续、可靠运转的复杂系统，包括守时钟组、比对测量系统、原子时归算等多个环节。
At that time, keeping the system going required increasing support from abroad, primarily from Europe.
那时，保持系统运转需要来自国外，主要是欧洲的支持。
If it doesn't work, if you spend a lot time to keeping your system in order or slipping while trying to get things done then it might be time for a change.
如果不奏效，如果在完成工作的时候，你花了大量的时间维系或是进行你的这套系统，这时候也许是时候做改变了。
Keeping track of the state of the board and other system variables can be just as important as knowing what version of the FPGA was loaded at the time of a specific fault or failure.
记录具体故障和失败发生时板子的状态和其它的系统变量就和清楚加载了哪个FPGA版本一样重要。
In this paper, the approximate perturbation range of the state matrix of a linear time-invariant system is given, keeping the system controllability invariant.
本文给出了线性定常系统状态矩阵摄动时保持能控性不变的摄动区间的估计。
Experimental results show that this system has high frame rate which meets the requirement of real-time walkthrough in mass woods including natural scene, while keeping good visual effects.
实验结果表明，此系统具有较高的绘制速度，能满足包含大面积林木的自然场景实时漫游的要求，同时能达到一定的场景真实感。
Experimental results show that this system has high frame rate which meets the requirement of real-time walkthrough in mass woods including natural scene, while keeping good visual effects.
实验结果表明，此系统具有较高的绘制速度，能满足包含大面积林木的自然场景实时漫游的要求，同时能达到一定的场景真实感。
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