Linux内核提供了几个函数，可以用来将系统调用参数移动到用户空间中，或从中移出。
The Linux kernel provides several functions that you can use to move system call arguments to and from user-space.
集中参数系统是指这样一些系统，其物理特性都集中在一个或者多个集中体上，因此与空间分布无关。
Lumped parameter systems are those for which physical characteristics are assumed to be concentrated in one or more 'lumps' and thus independent of any spatial distribution.
经过模拟分析在不同参数条件下投影系统的空间光照度分布情况，直观地验证了上述投影系统的成像理论。
The computer simulation of the distribution of the imaging space illumination under different parameters gives a straightforward proof of the imaging principle applied in this projection system.
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