在测量基础架构中，用两级层次对计数器进行结构化。
Within the measurement infrastructure, counters are structured using a two-level hierarchy.
这款相机可以精确地测量亮度，能够透过表层“直视”下面的层次。
It can measure light so sensitively as to see through the top paint surface and uncover the layers below.
这种方法可以确保规划在需求层次上得到管理，而且实施需求的进度(正常情况下是事例或者用例场景)可以得到测量和管理。
This approach ensures that planning is managed at the requirement level and that the progress of implementing the requirements (normally stories or use case scenarios) can be measured and managed.
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