Clean classroom does not destroy the natural environment. We should stop off branches, no littering and other bad behaviors.
教室必须及时打扫与清理，不破坏自然环境，制止折树枝、乱扔垃圾等行为。
Clean classroom does not destroy the natural environment. We should stop off branches, no littering and other bad behaviors.
教室必须及时打扫与清理，不破坏自然环境，制止折树枝、乱扔垃圾等行为。
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