Sylvia_scj

A PET plastic bottle. Soft drinks bottles made from the synthetic material PET, or polyethylene-terephthalate. Light weight and unbreakable, they are particularly suitable for carbonated beverages. Nowadays PET can be readily recycled, almost as easily as glass. The first step is to separate the materials according to type of plastic and colour. The bottles are carried on the conveyer belts past a series of detectors .They fly off the belt as if snatched by an invisible hand. X-ray eyes recognize all the items, register the different structures of the plastics. Expensive, fast computers can even compensate for errors in reading the paper labels. They can recognize a green PET bottle even when it is carrying a white label. A camera supplies the data for colour sorting. An extremely fast computer controls the air jets. And here we see the result of two hours of sorting procedure. Cleanly separated clear PET *** the labels in different colors. It would be perfectly possible to produce new PET bottles from these fragments. A light weight bottle like this has ecological advantages when it comes to transport. Glass is 20 times heavier.

Sylvia_scj

标准答案里少了一句，And here we see the result of two hours of sorting procedure. 后面的那句

Sylvia_scj

这句里有一个还是两个单词我听不出来