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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：He is telling people not to drop litter.
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最佳答案：不准乱扔东西No littering要按时归还图书To return the book on time
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最佳答案：he used to Litter,but now he Cares for the environment very much
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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：翻译是：We shouldn't drop litter casually when we take a bus.shouldn't：不应该 drop litt
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最佳答案：No graffitoNo litteringKeep trampling off grassNo wanton logging
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最佳答案：I do not know
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最佳答案：Do not discount flowers 勿折花木Registered guests 来宾登记Do not trample on the lawn 请勿践