操作系统将对VPA中与所使用的资源相对应的字段进行设置，并在VPA中维护它们的浅副本。
The operating system sets the fields corresponding to the used resources in the VPA and maintains a shallow copy of them in the VPA.
开发人员通过运用操作系统抽象层，可使用跨多种操作系统平台的标准API，降低与编码维护和学习几种操作系统相关的成本，缩短相关时间。
With OS Abstractor, developers use a standard API interface across several OS platforms, reducing the costs and time associated with code maintenance and learning several operating systems.
介绍了并联系统ups的特性及其实现，现场外接旁路的设计与具体操作，以及日常维护中的问题。
The characters and reality of double parallel system UPS, external bypass design and operation, and the Suggestions about the ordinary maintenance are introduced also.
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