But just like any other skyscraper, these 3-d chips have to keep the power flowing from layer to layer without overheating.
但正如其他摩天大楼一样，3 - D芯片需要保证各层之间的能量保证，但又需避免发热量过大。
2
Existing 3-D printers, also called rapid prototyping machines, build structures layer by layer.
已有的三维打印机也被称做快速成型机，可以一层一层地构建出结构。
3
The first step in all 3-d printing processes is for software to take cross-sections through the part to be created and calculate how each layer needs to be constructed.