请保持街道清洁！
请保持这些街道清洁。
为了保持我们城市的清洁和美丽，清洁工总是在街道忙碌着。
To keep our city clean and beautiful, the cleaners are always very busy in the street.
为了保持我们城市的清洁和美丽，清洁工总是在街道忙碌着。
To keep our city clean and beautiful, the cleaners are always very busy in the street.
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