你应该知道如何保护自己免受沙尘暴的侵袭。

You should know how to protect yourself from dust storms.

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这只青蛙太笨了，不知道如何保护自己。

The frog is too stupid to know how to protect itself.

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但世事难料，也许，知道如何保护自己并不是一件坏事。

It may not be a bad thing to know how to defend yourself.

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当我们处于危险之中，我们应该知道如何保护自己。

When we are in danger, we should know how to protect oneself.

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万一超自然力量被用来对付我们的话，我们还需要知道如何保护自己。

We also needed to know how to protect ourselves should they be used against us.

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不知道如何保护你自己。

You don't know how to protect yourself.

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看了这些图片之后，你就知道该如何保护你自己了。

Looking at these photos, you can learn how to protect yourself.

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看了这些图片之后，你就知道该如何保护你自己了。

Looking at these photos, you can learn how to protect yourself.

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