【英语时差8,16】回收塑料
时间：2018-12-27 作者：英语课 分类：英语时差8，16
Recycling Plastics When plastic containers are recycled, they are first cleaned, then ground into tiny pellets and put into a flotation tank. This separates out the various plastic resins 1 from other waste material. Once they are separated out, the plastic resins are ready for reuse. They are melted down, then molded into new plastic products. Plastics are made mostly of polymers, large molecules 2 of carbon and hydrogen and oxygen. These polymers can be mixed with a number of other ingredients, including stabilizers, fillers, and coloring agents. This makes for a wide variety of types of plastic, having many different useful properties. Unfortunately, this variety also makes plastic one of the most difficult things to recycle. The biggest problem for plastic recyclers is that plastics come in many different types, and it’s impossible to tell some of these apart just by looking at them. For example, two liter soda 3 bottles are made of a plastic called polyethylene terephthalate, or P.E.T.. Another type of plastic, polyvinyl chloride, can look just like P.E.T., but if a small amount of it is present with the soda bottles you are recycling, it can ruin the entire batch 4. To help prevent this problem, manufacturers stamp all plastic products with a recycling code number. Plastics are grouped into seven categories. P.E.T. plastic is number one, while polyvinyl chloride is number three. Milk jugs 5 and plastic grocery bags are both number two. It’s important to separate your plastics very carefully before you recycle them. And remember: carrying your bottles to a recycling center is just the first step. It’s just as important to BUY items made from recycled material as it is to recycle them.
- The resins were used to turn out millions of helmet liners. 用这类树脂生产了成百万只钢盔内衬。 来自辞典例句
- Cheapness is one of the main attractions of polyester resins. 廉价是聚酯树脂受到欢迎的主要原因之一。 来自辞典例句
- The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
- Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里，大分子裂变为小分子。
- She doesn't enjoy drinking chocolate soda.她不喜欢喝巧克力汽水。
- I will freshen your drink with more soda and ice cubes.我给你的饮料重加一些苏打水和冰块。