了解历史对于了解我们自身作为一个民族和一个国家都是至关重要的。
Understanding history is vital to understanding ourselves as a people and as a nation.
如果你想成为一名初级护林员，你需要了解自然和文化历史，并承诺成为一名国家公园保护者。
If you want to be a Junior Ranger, you need to learn about the natural and cultural history, and make a promise to be a national park protector.
在那个时候，我发现，我对自己的国家的历史竟然一点都不了解。
At that moment, I discovered that I did not even know my own nation's history.
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