VOA慢速英语:荷兰发明家展示从河流中去除塑料的装置

arteries – n. large roads, rivers, railroad lines, etc.

cheaper – adj. at a lower price

deflect – v. to keep something, such as a question, from affecting or being directed at a person or thing

litter – n. things that have been thrown away and that are lying on the ground in a public place; a messy pile or group of things

source – n. the cause of something, such as a problem