学生不可能允许投掷废弃物，大家必须保护我们的环境和使它干净和整洁。
Students can not be allowed to throw litter about, Everyone must protect our environment and make it clean and tidy.
学生不可能允许投掷废弃物，大家必须保护我们的环境和使它干净和整洁。
Students can not be allowed to throw litter about, Everyone must protect our environment and make it clean and tidy.
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