The lower layers are more dense than those at the top.

较低的冰层比最高的冰层更密集。

You can expect even more damage to the lower layer of your skin, AKA the dermis.

你的皮肤下层，也就是真皮层，可能会受到更多的损伤。

Activity in lower layers can affect how neurons in the higher layers fire.

较低层的活动会影响较高层神经元的放电方式。

When we talk about a lower level or a lower layer, in terms of space, like...

当我们谈论较低级别或较低层时， 就空间而言， 例如. . .

That's because these are bones that are formed completely within the dermis, which is the lower layer of the skin.

那是因为这些是完全在真皮内形成的骨骼，真皮是皮肤的下层。

It looked to them as if the lower layer of sandstone had been thoroughly colonised by worms over months or even years.

在他们看来，沙岩的下层地层中几个月甚至几年都可能住满蠕虫。

The fibres in the upper and lower layers, are long and horizontal; those of the middle one, very short, and running cross-wise between the outside layers.

上层和下层的纤维又长又直；中层的纤维则很短，在上下两层之间交叉分布。

It is heading toward Mount Sharp, where it will study the lower layers of that Martian peak and search for clues about the planet's evolution.

它正前往夏普山，在那里它将研究火星山峰的下层并寻找有关地球演化的线索。

Firstly, as the majority of post-80 and -90 generation college students are at school or in the lower layers of social myriad, they are vulnerable to their superior’s judgments.

首先，绝大部分的80、90后大学生都是在校学生，或是处于社会的底层，他们总是受到老者的批评。

While in the upper layers of the city, people could walk undisturbed between elegant palaces and streets, the lower layer was the place for services, trade, transport and industry.

在城市的上层，人们可以不受干扰地行走在优雅的宫殿和街道之间，而下层则是服务、贸易、交通和工业的场所。

However, in 1995 Optically Stimulated Luminescence(OSL) testing was carried out by the Oxford Archaeological Unit on soil from two of the lower layers of the horse's body, and from another cut near the base.

然而，在 1995 年，牛津考古单位对马身体下层的两层土壤和底部附近的另一处切口进行了光激发光 (OSL) 测试。