The reduced density of the bird skeleton provided a light but strong frame.

减轻了的骨架密度则提供了轻巧而坚固的身体框架。

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The key to this is the reduced density of the atmosphere, which affects how fast the ball moves through the air and also the bend of a spinning ball.

此处的关键在于大气的折合密度，它会影响球在空中穿越的速度以及旋转球的弯曲度。

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Using it we can conveniently and simply convert a ME into its corresponding differential equation and from solution of which we can extract the reduced density operator.

该方法能方便、简洁地将密度主方程转化为对应的普通微分方程，并能从微分方程的解中提取出约化密度算符。

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Your mass is reduced so that your density is the same as usual.

WSJ: How to Ace a Google Interview

For patients at the highest risk of heart attack, the new guidelines suggest that "bad cholesterol, " or low-density lipoprotein (LDL), be reduced to 70 mg per deciliter--although the new guideline is optional.

FORBES: Cholesterol Guidelines A Gift For Merck, Pfizer

Since He is much less dense that air (He has only 14% of the density of air) the drag and flutter of the platters in the drives is reduced.

FORBES: Rare Gases and Fine Lines