So suburb-ringed cities with low overall densities are much less efficient than those that are tightly-packed.

所以，总体密度低的郊区环线城市的效率要比那些紧密的城市低很多。

It was also very low density, just what you'd expect for a loosely bound rock pile.

它的密度也很低，正如你所想象的的松散的岩石堆。

They discovered that patients with depression had a lower density of synapses than healthy people of the same age.

他们发现，抑郁症患者的突触密度低的健康人群。

But, despite their length, tails are incredibly low density, as low as a few hundred atoms per cubic centimeter.

但是，尽管尾巴很长，它的密度却低得令人难以置信，低到每立方厘米只有几百个原子。

They live in low densities, they're extremely well camouflaged, and when they move, they stay low to the ground.

它们数量稀，又极善伪，在移动时，身体会尽量贴近地面。

First, there's Looser zones, which are bands of low bone density that form on the surface of the bone.

首先，会有Looser区，即在骨表面形成的低密度带。 小编注：Looser区以瑞士外科医师Emil Looser命名。

Wyoming has the lowest population overall, but Alaska, which is by far, the largest state has the lowest population density.

蒙大拿州总体上人，但阿拉斯加是远远大的州，人密度低。

These felines live at very low densities, and between two potential mates may be dozens of kilometers of harsh terrain.

这些猫类生物的密度非常低，可能几十公里的恶劣地形才能遇到一个潜在的伴侣。

Whereas this is much squishier, this is low density polyethylene.

虽然它更柔软， 但它是低密度聚乙烯。

Small city, we have low density, make the design more romantic.

小城市，我们低密度，让设计更浪漫。

The comet has a very low density, similar to rubble-pile asteroids, so it was expected that the surface would be soft.

彗星的密度非常低，类似碎石堆积的小行星，所以它的表面应该会是柔软的。

Meanwhile, lighter substances with lower density, like plasma, move to its center.

与此时， 密度较低的较轻物质，如等离子体，会移动到它的中心。

However, even people who exercise often can have low bone density.

然而，即使是经常运动的人，骨密度也会偏低。

Then, you go to medium density, low density and higher density again.

然后，您再次进入中密度、低密度和更高密度。

Objects with lower density, like stuff that's made of organic materials, will allow more of the lower-energy X-rays to pass through.

低密度的东西，像有机材质的东西，会让低能级的X射线穿过。

Let's start with a fun city that has a pretty low population density.

让我们从一个人密度很低的有趣城市开始。

Hargett was surprised when the doctors told him that he had low bone density.

当医生告诉他他的骨密度很低时，Hargett 感到很惊讶。

Northern forests offer the lowest human density of any tiger habitat, and the most complete ecosystem.

北方森林是所有老虎栖息地中人类密度低的， 也是完整的生态系统。

But unlike similarly large nations, the nordic countries have some of the lowest population density in the world with only 26 million total residence.

但是不其他差不多面积的国家，北欧国家人密度是世界上数一数二低，总人数只有 2600 万。

The research team found a link between raised levels of a type of cholesterol called LDL, low density lipoprotein, and the development of disease.

该研究团队发现，这种名为低密度脂蛋白（简称LDL）的胆固醇水平的升高与患痴呆症有关联。