Teeth have a hard surface layer called enamel.
牙齿有一层叫做釉质的坚硬表层。
The paintings were concealed beneath a thick layer of plaster.
那些画被隐藏在厚厚的灰泥层下面。
The baby whale develops a thick layer of blubber to protect it from the cold sea.
幼鲸长出一层厚脂肪以抵御冰冷的海水。
Beneath the soil lies a layer of bedrock.
土壤下面有一层基岩。
They found a unique layer of sediment worldwide.
他们在世界各地发现了一层独特的沉积物。
A liquid layer forms at the base of the glacier.
在冰川的底部形成了一层液体。
This seam of coal reposes on a layer of clay.
这个煤层处于一层黏土岩之上。
When the Nile is in flood, it deposits a layer of mud on the fields.
尼罗河泛滥时，在田野上沉积下一层泥。
The archaeologists had to remove a layer or reeds and ropes that covered the burial.
考古学家已经去除了一层覆盖于木乃伊上的芦苇和绳索。
It might be much older than the layer or even the site where it was found.
它可能比它所处的那个地层、甚至比发现它的遗址都要古老得多。
You see, adult female birds during egg production produce a layer of spongy bone tissue inside certain long bones.
你看，成年雌鸟在产蛋的过程中会在某些长骨内产生一层海绵状的骨组织。
During the seventeenth and eighteenth centuries, the entire site became covered with a layer of hard grey clay, which minimised further erosion.
在十七世纪和十八世纪，整个遗址被一层坚硬的灰色粘土覆盖，这极大减少了进一步的侵蚀。
Other options to restore the frescoes would have required using chemicals to remove the unwanted layer or using physical means to scrape it off.
其他修复壁画的方法可能需要使用化学物质来去除不需要的层，或者使用物理方法将其刮掉。
Geologists think that this fluidized ejecta crater indicates that a layer of permafrost, or water ice, lies just a few meters under the surface.
地质学家认为，这个具有流体化喷出物的陨石坑表明，在地表下几米深处有一层永久冻土层或水冰。
Most marine deposits from around the world contain either plankton or a lot of fern spores but not both together in the same layer.
世界上大多数的海洋沉积物不是含有浮游生物就是含有大量的蕨类孢子，但它们并不是同时存在于同一层中。
It sews leaves together in the shape of a cup, then it adds a layer of straw to the inside of the cup and lays its eggs there.
它把叶子缝合成杯状，然后在杯子里面铺上一层稻草，在那里产卵。
Once the humus layer disappears, nutrients cannot be recycled and leach from the soil, converting soil from fertile to infertile and making it suitable only for savanna vegetation.
一旦腐殖质层消失，养分就无法从土壤中回收和过滤，致使土壤由肥沃变为贫瘠，只适于热带草原植被的生长。
Afterwards during the season of subsidence, the water would subside, or recede, revealing a new layer of fertile black silt and allowing for the planting of various crops.
在随后的沉降季节，水会退去，并露出一层新的肥沃的黑色淤泥，可以在这上面种植各种作物。
Just below the chromatophores is a layer of cells that reflect light from the environment, and these cells help the octopus create a precise match with the colors that surround them.
色素团下面是一层细胞，它可以反射周围环境的光，这些细胞可以帮助章鱼精确地匹配周围的颜色。
Basal slip or sliding as it's often called, basically refers to the slipping or sliding of a glacier across bedrock, actually across a thin layer of water on top of the bedrock.
底部滑移，也通常被称为滑动，大致指的是冰川在基岩上的滑动，实际上是在基岩上部的一层薄薄的水上的滑动。
Emergents, which do not form a continuous layer, are usually the giants of the forest, reaching heights of 35 to 70 m or more, and trunk sizes of over 2 m in diameter.
不形成连续层的新生植物通常是森林中的巨人，高度可达35至70米或更高，树干直径超过2米。
Using galvanised clout nails with large heads, start to nail the first layer of felt onto the decking.
使用镀锌的大头钉，开始把第一层毛毡钉在甲板上。
看见调整层。
Now activate and show the texture layer.
现在激活和显示纹理层。
In the angiosperm the seeds are wrapped in an additional layer of covering.
被子植物的种子被另一层覆盖物包裹着。
On the third layer, apply the "Glowing Edges" effect.
在第三图层上，应用“发光边缘”效果。
Toggling layer visibility no longer makes a hidden layer active.
切换图层可视性不再使一个隐藏层激活。
The presentation layer ensures that the information that the application layer of one system sends out is readable by the application layer another system.
表示层保证由一个系统的应用层所发出的信息，另一个系统的应用层可以读懂。
Between the last layer of Cretaceous rock and the first layer of Cenozoic rock, there is often a thin layer of clay.
在最后一层白垩纪岩石和第一层新生代岩石之间，常常有一层薄薄的粘土。
Because of the cold temperatures, the tundra has two layers: top layer, which is called the active layer, is frozen in the winter and spring, but thaws in the summer.
由于寒冷的气温，冻土带有两层：最上面的一层被称为活动层，在冬季和春季被冻结，但在夏季解冻。
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