If you want to make a totally new object,you need to make a virtual design in a CAD(computer aided design)file first.Or you can use a 3-D scanner to make a digital copy of an object.Then,based on the design or copy,the 3-D printer makes paper-thin slices out of liquid,plastic or metal and puts them together to create the object you want.

　　There are many areas in which 3-D printing could change our lives.One such area is healthcare.

　　Researchers have developed simple 3-D printed organs,which could be used in life-saving operations.

　　A 17-year-old boy in the US has also recently developed a brain-powered,3-D printed replacement hand.From heart monitors to fake limbs(四肢),we could soon be living longer thanks to 3-D printed technology.

　　Another area that 3-D technology looks sure to change is food.

　　Can you imagine being able to print your favorite dishes at home at the touch of a button?Even big companies are behind the trend.

　　Hersheys,one of the largest chocolate makers in the world,recently announced that it would start producing chocolate with the help of 3-D printers.

　　And don’t just think of the idea of 3-D printed food as a move to attract attention and customers.

　　NASA,the US space agency,has reportedly spent $125,000(767,594 yuan)developing a “3-D pizza printer”.

　　It is not yet clear how long it will take until 3-D printers are available to everyone.

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