It is argued that activity especially math activity includes two types: presentational operation and operation of thought, the latter is the main part of math activity.

指出：活动，尤其是数学活动包括两种类型：表象操作和思维运算，并强调：思维运算活动是数学活动的主要部分。

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The Four Imperatives provide a simplified way to analyze the physics and math that rule our energy and its delivery, the latter better known as power.

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The latter is a real possibility, because many consumers are notoriously bad at math.

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He prefers the latter, noting that the U.S. doesn't produce enough science, math and engineering graduates to fill the open posts in high-tech.

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