쓰레기 통에 뚜껑을 덮는 이유?

 

 

 

                                                쓰레기 통에 뚜껑을 덮어놓는 이유가 무었일까요?

 

 

                                                        정답은 저 밑에 있어요

 

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                                 먼지 들어갈까봐 덮어놓는다네요.ㅎㅎㅎㅎ