No company has been able to deliver a comprehensive alternative to the leading proprietary OS.

尚无任何公司可提供能够替代主流专属操作系统的综合备选方案。

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On top of this are the various proprietary systems that combine to form OS X.

在这之上，则是各种不同的专有系统，组合在一起构成了Mac OS X。

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Given the cost associated with building an OS like Linux, one wonders if proprietary companies will ever go it alone again.

考虑到与建立一个类似Linux的操作系统相关的费用，人们不禁要问，究竟这些控股公司是否又要单干了。

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Like its predecessors, the newest PalmPilot, the Palm III, is one of the best-designed bits of consumer electronics ever made. 3Com's proprietary operating system, the Palm OS, is amazingly intuitive and perfectly adapted to a device that most users turn on for mere seconds at a time.

FORBES: Small and beautiful