You've probably heard of some of these. One is low density lipoprotein — also known as LDL cholesterol.

你可能听说过其中的一些。一种是低白——也被称为低白胆固醇。

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

但是不同于其他差不多面积的国家，北欧国家人口是世界上数一数二低，总人数只有 2600 万。

She says the birds face a multitude of threats, including habitat loss and climate change, and that they're dwindling numbers low density and cryptic nature make them really hard to find.

她说这些鸟面临着诸多威胁，包括栖息地的丧失和气候变化，它们的数量正在减少，低和变幻莫测的自然环境使它们难被发现。

Montana's average population density statewide is thus only about 2. 9 people per square kilometer which is the third lowest density in America after only the notoriously empty states of Alaska and Wyoming.

因此，蒙大拿州的全州平均人口仅为 2.9 人/平方公里，在全美人口最低的州中排名第三，仅次于著名的阿拉斯加州和怀俄明州。

She says the birds face a multitude of threats, including habitat loss and climate change, and that they're dwindling numbers low density and cryptic nature make them really hard to find.

她说，这种鸟面临着众多威胁，包括栖息地丧失和气候变化，它们的数量正在减少，变低、神秘的自然环境使它们难被发现。

This is important: a gas giant like Jupiter has a low density, and a rocky metallic planet like Earth has a very high density.

像木星这样的气体巨星低，而像地球这样的岩石金属行星高。

Therefore, when we go for a swim in the Dead Sea, our body stays afloat on account of having relatively lower density than the surrounding water.

因此，当我们在死海中游泳时，我们的身体保持漂浮状态是因为它的比周围的水低。

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，这种名为低白（简称LDL）的胆固醇水平的升高与患痴呆症有关联。

The team found that the Chang'e-6 soil samples have a lower density than previous samples, indicating a more porous and loosely structured composition.

研究团队发现，嫦娥六号的土壤样本低于之前的样本，表明其成分更加多孔且结构松散。

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

低的东西，像有机材质的东西，会让低能级的X射线穿过。

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

蒙大拿州总体上人口最少，但阿拉斯加是远远最大的州，人口最低。

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。

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

他们发现，抑郁症患者的突触低于同龄的健康人群。

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带。 小编注：Looser区以瑞士外科医师Emil Looser命名。

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

所以，总体低的郊区环线城市的效率要比那些紧的城市低多。

In that case, the bigger object's mass is more spread out, so we say it has lower density, where density is how much mass is inside a given volume.

在这种情况下，更大的物体的质量更分散，所以我们说它的更低，就是给定体积内的质量。

If Montana were an independent country, it would be in the top four lowest densities in the world riding the company of countries like Namibia, Australia, and Mongolia.

如果蒙大拿州是一个独立的国家，那么它将与纳米比亚、澳大利亚和蒙古等国一起跻身世界人口最低的四个国家之一。

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

它们数量稀少，又极善于伪装，在移动时，身体会尽量贴近地面。

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

它的也低，正如你所想象的的松散的岩石堆。

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

彗星的非常低，类似于碎石堆积的小行星，所以它的表面应该会是柔软的。