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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In fact, our earth would face unprecedented crisis if we continued to exploit natural resources and destroy the natural environment.

事实上，如果我们继续这样无所顾忌地掠夺资源、破坏自然，那么我们的地球将面临前所未有的危机。

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For the destroy of the natural environment and the shortage of the food, many feline animals such as Siberian tiger. are in danger.

由于自然生态环境的破坏及食物的匮乏，野生东北虎等多种猫科动物处于濒危的境地。

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