尽管它的视觉效果如此显著，但尘埃只是位于恒星之间的物质的一个次要组成部分，其密度极低。
Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars.
另一项关于高中社交网络的研究发现，在特定的青少年网络中，异性友谊密度越高，欺凌和攻击行为就越少。
Another study of high school social networks found less bullying and aggression the higher the density of mixed-sex friendships within a given adolescent network.
超大碰撞可能剥去了水星的一部分岩石地幔，留下了一个金属核心，其密度与原来的岩石与金属的比例相比大得不成比例。
A titanic impact could have stripped away a portion of its rocky mantle, leaving behind a metallic core whose density is out of proportion with the original ratio of rock to metal.
月球的平均密度比地球低得多，但与地球的地幔密度大致相同。
The Moon's mean density is much lower than that of Earth but is about the same as that of Earth's mantle.
随着人口密度的增长，农作物的种植已经扩展到了越来越干旱的地区。
The cultivation of crops has expanded into progressively drier regions as population densities have grown.
所有板块都在缓慢移动，因为它们漂浮在密度更大的半液态地幔上，也就是地壳和地核之间的那一层。
All are slowly moving because the plates float on a denser semi-liquid mantle, the layer between the crust and Earth's core.
所有板块都在缓慢移动，因为它们漂浮在密度更大的半流体地幔上，也就是地壳和地核之间的那一层。
All are slowly moving because the plates float on a denser sem-iliquid mantle, the layer between the crust and Earth's core.
文字和插图按每英寸300个点的密度打印。
它展现了向着星团中心迅速增大的恒星密度。
It shows the dramatic increase in density of stars toward the cluster's center.
累进中性密度滤镜将保证你照片里的天空不会曝光过度。
A graduated neutral density filter will also help you make sure the sky isn't overexposed.
简单讲，能量密度指特定食物量中的卡路里(能量)含量。
Simply put, energy density is the number of calories (energy) in a specific amount of food.
与铀相比，钍的储藏量更为丰富，能量密度也更高。
Compared to uranium, thorium is far more abundant as well as much more energy-dense.
土卫十六密度较低，科学家因此推断它可能由多孔冰物质构成。
Its low density has led scientists to speculate that it may consist of porous, icy material.
力量训练会向骨骼施压，从而增加骨密度，降低骨质疏松风险。
By stressing your bones, strength training increases bone density and reduces the risk of osteoporosis.
今天宇宙学的一个关键问题就是：宇宙中物质的平均密度是多少？
One of the key scientific questions in cosmology today is: what is the average density of matter in our universe?
改变生活习惯绝非易事。结合能量密度理念制定饮食计划同样如此。
Changing lifestyle habits is never easy, and creating an eating plan using the energy-density concept is no exception.
科学家发现海马区——一个负责学习和记忆的区域——的灰质密度增加。
Scientists found increases in grey-matter density in the hippocampus—an area responsible for learning and memory.
人们可以测量思想的速度，就像测量岩石密度一样，这样的观点确实有点骇人。
The notion that the speed of thought could be measured, just like the density of a rock, was shocking.
但如果方法正确，凝视能增加双方的亲密度和爱意，加深两人的关系。
But done right, it can also increase feelings of closeness and affection and strengthen the bond between two people.
已证实，力量训练能增大骨质密度，增加瘦肌体积，改善姿势，减少损伤的风险。
Strength training has been proven to increase bone density, increase lean muscle mass, improve posture, and reduce the risk of injury.
骨骼密度的增加，意味着骨骼的强度加大，对防止损伤、疼痛以及关节炎极有益处。
The increase of bone density refers to the strengthening of the bones which helps prevent injury, pain, and arthritis.
物理学家说这个数据在计算像液体渗过不同密度的土壤这一类的问题时很有用。
The physicists say the data will be useful when calculating, for example, how liquids seep through soils of different densities.
相反，当大气二氧化碳浓度低时，气孔密度似乎增加了——就像长出更多的嘴来呼吸。
Conversely, when atmospheric carbon dioxide is low, stomatal density tends to increase - it's like getting more mouths to breathe with.
他们还能通过测量空间几何推断出宇宙中能量和物质的总密度，并推算暗能量的总和。
They can also measure the geometry of space. That allows them to deduce the total density of energy and matter in the universe and infer the amount of dark energy.
科学家们发现，海马体的大脑灰质密度增加了，海马体是大脑中负责学习和记忆的区域。
Scientists found increases in gray-matter density in the hippocampus—an area responsible for learning and memory.
我还建议，对人口密度、零售集群或者交通基础设施感兴趣的人可以去上海城市规划馆参观。
I also recommend a visit to the Shanghai Museum of Urban Planning to anyone curious about population density, retail clusters or transportation infrastructure.
临界密度的值非常小：它相当于每立方米约6个氢原子，从地球上的标准来看这简直是真空！
The value of the critical density is very small: it corresponds to roughly 6 hydrogen atoms per cubic meter, an astonishingly good vacuum by terrestrial standards!
临界密度的值非常小：它相当于每立方米约6个氢原子，从地球上的标准来看这简直是真空！
The value of the critical density is very small: it corresponds to roughly 6 hydrogen atoms per cubic meter, an astonishingly good vacuum by terrestrial standards!
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