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（单词翻译）
Rubbish in Rio
Vocabulary
sidewalks
American word for pavements; the part of the street where people walk
prove
show or demonstrate
appealed
made a serious or formal request
divided opinions
caused different groups of people to have very different feelings and views about an issue
opportunists
people who use a situation to get an advantage for themselves, sometimes unfairly
embarrassment
a feeling of shame about something bad that has happened
littering
dropping rubbish everywhere and not putting it in a bin
impose
force something (often, a rule or punishment) on a person or a group of people
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