Translate the paragraph into Chinese. 3D printing technology first appeared in the US in 1980s. 3D printing is a process of a three-dimensional solid object of virtually any shape from a digital model. It is achieved by using an additive process, where successive layers of material are laid down in different shapes. The technology is used for both prototyping (模型设计) and distributed manufacturing (分布式制造) in jewellery, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, medical industries, geographic information systems, civil engineering, and many other fields. In 2015, a 3D printing technology developed by Silicon Valley startup, Carbon3D Inc., enables objects to rise continuously from a liquid medium rather than being built layer by layer as they have been for the past 25 years, representing a fundamentally new approach to 3D printing. Futurologists believe that 3D printing signals the beginning of a third industrial revolution.