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最佳答案：No littering
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最佳答案：don't throw rubbish into the rive
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最佳答案：don't leave about the garbage.例句垃圾污染环境,损害健康,不要到处乱扔垃圾.Garbage pollutes environmen
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最佳答案：no litteringno logging
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最佳答案：Don't litter on the ground.Don't throw rubbish onto the ground.
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最佳答案：We should not throw rubish all aroundYou know that now rubish issue is so seriou
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最佳答案：He is telling people not to drop litter.
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最佳答案：Would you mind not leaving litter out of the window?
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最佳答案：不要随地吐痰Don't spit on the floor不要随地吐痰或乱抛垃圾Do not spit or litter.不要乱扔垃圾Don't litter
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最佳答案：how to protect the school envirnmentAS we all know,school is another home for us