说明： APR(Apache portable Run-time libraries，Apache可移植运行库)的目的如其名称一样，主要为上层的应用程序提供一个可以跨越多操作系统平台使用的底层支持接口库。 (APR (Apache portable Run-time libraries, Apache Portable Runtime library) if the purpose of the same name. mainly for the upper application can provide a number of operating system platforms across the bottom to support the use of the interface.)
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