Low average population densities are characteristics of most underdeveloped countries.
平均人口密度低是大多数不发达国家的特点。
As densities increased, domestic architecture became larger, culminating in crowded pueblos.
随着密度的增加，住宅建筑变得更大，最终形成拥挤的村庄。
The cultivation of crops has expanded into progressively drier regions as population densities have grown.
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。
Rock lobsters prey on sea urchins, and increased rock lobster densities coincided with significant decreases in urchins.
岩石龙虾以海胆为食，而岩石龙虾密度的增加正好与海胆数量的显著减少相吻合。
After several generations of population growth, people packed the landscape in densities so high that communal pueblos may have been a necessary outcome.
经过几代人的人口增长，人们以如此高的密度挤满了这个地区，以至于公共聚居地的出现可能是一个必要的结果。
By compiling a map of seismic velocities from thousands of earthquakes across the globe, they can also begin to map temperatures and densities throughout the mantle.
通过编制全球数千次地震的地震速度图，他们还可以开始绘制地幔的温度和密度图。
The densities of the terrestrial planets average about 5 times the density of water, whereas the Jovian planets have densities that average only 1.5 times the density of water.
类地行星的密度的平均值大约是水的密度的五倍，而类木行星的密度平均值只有水的密度的1.5倍。
Crown of thorns starfish normally live in high population densities.
刺冠海星通常生活在聚居的环境中。
However, near hydrothermal vents, areas of the ocean where warm water emerges from subterranean sources, live remarkable densities of huge clams, blind crabs, and fish.
然而，在海底热液喷口附近，也就是温暖海水从地下涌出的地方，生活着大蛤、盲蟹和鱼类，数量非常庞大。
If the two media have really different densities, like air and water, then most of the energy is going to be reflected back, very little of it will keep going and get transmitted into the new medium.
而如果这两种介质的密度相差较大，就像空气和水那样，那么大部分的能量将会折射回来，只有一小部分会继续传播进入到新的介质中。
I have a question about densities.
我对密度有个问题要问。
These are the probability densities, right?
这就是概率密度，对吗？
Permits different harbor water densities.
港水密度不同的许可证。
They both had bone densities of a 77-year-old woman。
有一对23 岁的双胞胎姐妹参加了我们的研究项目，她们的骨密度相当于一个77 岁老妇的骨密度。
They have high body densities and can't help but sink.
它们的身体密度很高，没有办法不下沉。
This is, however, true of this octave of densities .
然而，在这个八度音程宇宙中是真实的。
Our Stipple params create varying densities of noise to simulate that look.
我们的画点画参数创造不同密度的噪音模拟的期待。
The push pin color scheme shows population densities based on the color spectrum.
pushpin颜色方案基于色谱显示人口密度。
With no natural enemies, their densities reached 10 to 100 times that of Argentina.
因为没有天敌，火蚁的种群密度达到阿根廷的十倍甚至百倍。
The content of the survey involved the volume density, surface and length densities.
内容涉及到各种组织的体积分数、面积密度、长度密度等。
In large parts of America, where population densities are lower, it would be much costlier.
而在美国，由于人口密度更低，投递费用还会更高。
Many branches were closed, and by 2006 Sweden had one of the lowest branch densities in Europe.
许多分行关闭了。到2006年，瑞典成为欧洲分行密度最低的国家之一。
Stars with similar masses might not be similar in size because they have different densities.
相似质量的恒星可能在大小上有所不同，因为它们有着不同的密度。
Since density is mass divided by volume, the relative densities and relative sizes give the relative masses.
由于密度是质量除以体积，相对密度和相对大小给予相对群众。
These major arms have the greatest densities of both young, bright stars and older, so-called red-giant stars.
这些主要臂上有最大密度的年幼明亮恒星和较老的红巨星。
Oxygen densities in both buildings were about 21%, high enough for workers to enter the buildings, the firm said.
两座建筑的氧气密度都在大约21%，足够让工人进入建筑，这家公司如是说。
However, at times of high vector densities the relative importance of mosquito-to-human transmission may increase.
不过，在媒蚊密度较高时，蚊虫向人传播病毒的相对重要性可能增加。
And the electronics industry needs much greater data densities for tomorrow's iPods, smart phones, and other devices.
为了明天的新iPod、智能手机和其他电子产品，现代电子工业需要更大的存放密度和更长的存放时间。
And the electronics industry needs much greater data densities for tomorrow's iPods, smart phones, and other devices.
为了明天的新iPod、智能手机和其他电子产品，现代电子工业需要更大的存放密度和更长的存放时间。
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