Let's consider four levels of a generic operation.
让我们考虑一个通用操作的四个步骤。
So you have to drill down four levels to get the data.
因此，为了获取数据，必须深入4层。
Both figures show the four levels of the example process.
两个图都显示了示例流程的四个级别。
All of these four levels form the core of this research.
这四个层次的指标体系构成了本文的研究核心。
There are four levels of sleep, each being a little deeper…
睡眠分为四种层次，每层都比上层的状态深一点。 …
There are four levels of sleep, each being a little deeper…
睡眠分为四种层次，每层都比上层的状态深一点。 …
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