?保持清洁

... But some people don't care about it。但是有些人却不关心或不在意。 Keep clean。保持清洁。 Treat kindly the Earth is to treat kindly oneself。善待地球就是善待自己。 ...

?维护清洁你我有责

... 请勿攀爬 No Climbing 维护清洁你我有责 Keep Clean 请关紧 Turn off Completely ...

?保持干净

... For Litter Please 请将垃圾倒入箱内 Keep Clean 保持干净 No Garbage Here 此处禁止垃圾 ...