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1·The term 'cardboard city' was coined to describe communities of homeless people living in cardboard boxes.

人们创造了cardboard city一词，用来指居住在纸板棚屋里无家可归者的居住区。《牛津词典》

2·Every city in Asia and Latin America has an industry based on gathering up old cardboard boxes.

亚洲和拉美的每个城市都有回收纸箱的生意。