There are many kinds of work. There's electrical work, take the motor, you plug it into the wall, electricity makes the fan go around, that's electrical work. There's magnetic work.

我们复习一下大一,学过的功的概念：,物体在力的作用下，运动了一段距离。

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There's a second alternative: A growing number of New Yorkers are going for duct-free AC systems that involve a small, wall-mounted indoor fan powered by a separate outdoor unit the size of suitcase.

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At the age of 29, for example, Jennifer Fan is already a Wall Street veteran.

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The sinuous or angled wall, the curve, the fan that dominated his plans were not arbitrary gestures, they were responses to a particular place and program.

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