Thus, you can identify at least two levels of service abstraction, namely the high level of activities and the low level of application services manipulated by activities.
因此，您至少可以确定两个级别的服务抽象，即高级活动和由活动所操作的低级应用程序服务。
It's not abnormal: the SAX parser is very low level, so the application has to take over a lot of the work that a DOM parser would do.
这没什么不寻常的：sax语法分析器的级别很低，所以应用程序必须接管本来由DOM才能完成的大量工作。
Performance testing with JUnitPerf is by no means an exact science, but it is an excellent way to ascertain and monitor low-level performance of application code early in a development life cycle.
用JUnitPerf进行性能测试无疑是一门严格的科学，但在开发生命周期的早期，这是确定和监控应用程序代码的低端性能的极佳方式。
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