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。
The ozone layer screens out dangerous rays from the sun.
臭氧层能遮挡住来自太阳的有害射线。
It is widely known that CFCs can damage the ozone layer.
众所周知氯氟烃会破坏臭氧层。
They will press for international action to safeguard the ozone layer.
他们将竭力要求国际行动来保护臭氧层。
Ozone forms a protective layer between 12 and 30 miles above the Earth's surface.
臭氧在距地球表面12至30英里的地方形成一个保护层。
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。
Wherever these particles settled, they formed a pan, a layer that water couldn't penetrate.
不管这些粒子沉降在哪里，它们会形成一个平面板块，一层水无法渗透的平面。
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 trust that the peeling of your fluff will reveal slowly, one layer at a time.
你相信你的绒毛会慢慢地、一次一层地剥开。
The resulting smaller bubbles also yield a layer of foam whose texture is rich and creamy.
由此产生的较小的气泡也会让产出一层质地浓郁、像奶油一般的泡沫。
As the tree grows, it adds a layer to its trunk taking up chemical elements from the air.
随着树木的生长，它在树干上增加了一层吸收空气中的化学元素而生成的膜。
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。
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。
Sediment above and below the gypsum layer contained tiny marine fossils, indicating open-ocean conditions.
在石膏层上方和下方的沉积物中含有许多小型海洋生物化石，这表明这里的海洋环境很开放。
You can use this by selecting one layer, or certain layers to show the properties for those layers only.
你可以选择一个图层或者某些图层，通过用这种方法，仅显示那些层的属性。
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。
3D printers are used to build an object with liquid plastic. They build the object layer by layer until it is complete.
3D打印机用液体塑料来建造物体，他们一层一层地建造着物体，直到完成。
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。
If you peel birch bark in the winter, we call it "the winter bark", another layer, a tougher inner layer of the tree adheres to the bark, producing a stronger material.
如果你在冬天剥桦树皮，我们称它为“冬树皮”，另外一层更加坚硬的紧贴树皮的树层就可以生产出更强更硬的材料。
There're two reasons for this: first, they live in the active layer, which, remember, contains water that doesn't penetrate the permafrost.
造成这种情况的原因有两个：首先，它们生活在活动层中，请记住，活动层中包含的水不会渗透永久冻土。
Soon layer of oceanic ooze began to accumulate above the old hard layer.
很快，海洋软泥层开始在原先的硬地层上面堆积起来。
This layer of water reduces friction.
这层水减少了摩擦。
Beneath this active layer is a second layer called "permafrost", which is frozen all year around, and is impermeable to water.
在这一活跃层下面，是被称为“多年冻土”的第二层，终年冻结，不透水。
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