reduced density

基本解释

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。
The gene-altered lab mice also had reduced density of neuron development, a key measure of brain activity.
基因改变了的实验鼠也减少了神经元数量，而神经元数量是衡量脑部活动的关键。
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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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.
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