较底层的部分则来自于Mach，并且许多诸如虚拟内存子系统和排程器的部分，都在最近的版本中被大量重写了。
The lower parts come from Mach and a lot, such as the virtual memory subsystem and scheduler, have been heavily reworked in recent versions.
这意味着新的FreebSD的排程器并未出现在OS X中。
This means that the new FreeBSD scheduler is not present in OS X.
节目分送子系统的目标是根据节目排程自动把省中心视频服务器节目及相应的资料下载到地市州视频服务器中。
The subsystem of distributing and delivering program from the video server in the province center to the video server in the counties or states according to the schedule.
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