只有通过保护环境，我们才能向子孙后代承诺给他们一个美丽的地球。
Only by protecting the environment can we assure our later generation of a beautiful planet.
再怎么强调保护环境的重要性也不为过，因为我们只有一个地球。
We cannot emphasize the importance of protecting the environment too much because we have only one Earth.
我们都听说过孤独而英勇的探险家的故事，但是在地球上许多不同地方引导和保护欧洲探险家的当地人呢？
We have all heard tales of lone, heroic explorers, but what about the local individuals who guided and protected European explorers in many different parts of the globe?
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