[交流] 每周一听——那些年我们一起练过的听力（第179期）已有27人参与

每周一听——那些年我们一起练过的听力（第179期）

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Since the early 1980s, 3-D printers have evolved from highly sophisticated lab   (1)    into affordable consumer items, enabling their owners to create their own increasingly complex designs.

Some futurologists see this as the beginning of the third industrial    (2)    , but environmentalists fear that the last thing the world needs is more nearly    (3)    plastic objects in landfills and oceans.

The main culprit is    (4)    petroleum-based plastic. There are environmentally friendly alternatives like polylactic acid plastic, or PLA, based on sugar from maize and    (5)    -- but they are more expensive.

Michiel Dusselier, a researcher at the University of Leuven, said scientists have found a way to    (6)    PLA faster and cheaper than before.

“Instead of a two-step process currently, it's a one-step process. Our process runs about 100 degrees centigrade lower in temperature and our    (7)    , which is kind of how much product can you make per volume of reactor per hour, are much higher and our product is also much cleaner, so we don't make side products,” said Dusselier.

PLA is one of the few types of plastic    (8)    not only for 3-D printers but for some biodegradable medical items such as suture threads.

“I think there will now be much more players in the market giving you the product at much lower prices and I think this will maybe really be the start of the PLA into the  bio-plastic business,” said Bert Sels, a professor at the University of Leuven.

Although PLA is not suitable for all    (9)    , a petrochemical company is already developing the new process for mass production, raising hopes that more plastic products will soon be made of biodegradable    (10)    .
小伙伴们，上一期活动又有新的小伙伴加入我们，我表示热烈的欢迎新的小伙伴，希望看到你们一如既往的坚持，让我们坚持每周一听，每周进步一点点，要相信量变是会引起质变的，加油！加油！加油！金币奖励活动将继续，凡是连续参加4期本活动的小伙伴，请私信我！“Knowlegde can change your fate and English can accomplish your future. ” ，小伙伴们让我们行动起来吧！“Keep on going never give up.”
上期答案
1. consequence
2. carnivores
3. poses
4. interactions
5. leopards
6. sanctuaries
7. gauge
8. populated
9. compensated
10. alternative