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。

youdao

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。

youdao

The top layer should now point down to the layer beneath.

顶部图层应当指向下面的图层。

youdao

The artist can then add a second color of glass to make designs over the first layer of glass.

VOA: special.2009.09.16

But I'm sure you can easily see how these styrofoam balls could, in fact, be a mono layer of gold nuclei.

这个实验怎么工作的,我们先来做些计算，但我相信你们都已经。

麻省理工公开课 - 化学原理课程节选

there are many genes that are already expressed and presented in this dimpling and thickening of the outer layer.

在外胚层的凹陷和增厚过程中,表达了很多基因。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

"It's like baking a layer cake, but doing it one layer at a time, " said Atala.

CNN: Scientists 'seed' cells, make new organs

Some particles, however, are energetic enough to puncture the top layer and strike the second layer.

ECONOMIST: Orbital debris

You have to add to this layer upon layer of professional interest groups having their say.

BBC: Health Bill: Where's the strategic argument?