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最佳答案:No littering
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最佳答案:He is telling people not to drop litter.
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最佳答案:no litteringno logging
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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