The most important thing we can learn about water, however, is that we must protect it and use it wisely.

我们能学习水，然而的最重要的事物，是我们一定聪明地保护它而且使用它。

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The most important thing we can learn about water, however, is that we must protect it and use it wisely. Our future depends on it.

然而我们所了解到的关于水的事情中最重要的是：我们必须保护并合理利用它。我们的未来取决于水。

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We must use all our scientific artifice to protect it.

我们必须使用我们所有的科学手段来保护它。

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We must act today to protect it for the future.

UNESCO: OFFICE IN BRASILIA

We must not protect information merely because it reveals the violation of a law or embarrassment to the government.

WHITEHOUSE: President Obama: Our Security, Our Values

To protect it, we must first better understand marine biodiversity.

UNESCO: OFFICE IN BRASILIA