user application的用法和样例：
例句
- The alternative redistribution approach is to install private side-by-side assemblies of a particular user application.
其他重新发布方法为安装特定用户应用程序的私有并行程序集。 - Userland threads are implemented entirely in an application program, with no explicit support from the kernel.
用户线程全部通过用户应用程序实现，不是由内核来明确支持的。
