VOA慢速英语:Plastic Eating Worms May Cut Pollution

biodegrade – v. to break down by natural processes or bacteria.

riddle – v. to make many holes in with something

obvious – adj. easy to notice or see

organic – adj. of, relating to, or obtained from living things

polymer – n. a chemical compound that is made of small molecules that are arranged in a simple repeating structure to form a larger molecule