Studies of negatives have been focused on morphological, syntactic and logical levels.

学术界对于否定的研究侧重于形态、句法和逻辑层次。

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Markup shall be used to associate data cells and header cells for data tables that have two or more logical levels of row or column headers.

对付含有两个或更多个逻辑级别的行标头和列标头的数据表，应该利用标记来关联干系数据单位格和标头单位格。

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Desperate to make ends meet while still maintaining existing levels of services, they did the logical thing: They cried to Washington, D.

FORBES: Days Of Reckoning Await The Municipal Bond Market

The reason is that such a document spells out a logical asset allocation given one's financial goals, discusses the historical levels of volatility inherent in the chosen allocation and mentally prepares the investor for the harsh reality that periods of "black swan" events do happen.

WSJ: The Experts: Lessons from the 2008 Meltdown