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Giant sequoias are the largest trees on Earth. They can grow for more than 3,000 years.
巨红杉是地球上最大的树木，它们可以生长3000多年。
But without fire, they cannot reproduce.
但如果没有火，它们就无法繁殖。
The giant sequoias really are born of fire. A fire gives them 3 things they need for regeneration.
巨红杉真的是火生的，火给了他们三种再生所需的东西。
The first one is, it punches a hole in the forest - that allows there to be more light and more water for the sequoia seedlings.
第一个是，火在森林里打一个洞，让红杉幼苗有更多的光和水。
The second thing it does is it heats the cones up in the mature sequoia trees, without harming the trees and those cones open and there's a rain of seeds on the ground.
第二个是，火在不伤害树木的情况下，可以加热成熟的红杉树的球果，这些球果打开了，种子就像雨点一样落在地上。
And, the final thing it's done is it's cleared away all the leaves that have built up.
最后火要做的是清除所有堆积起来的叶子。
Because sequoia seeds need to hit bare mineral soil before they can germinate, and survive well.
因为红杉种子需要接触裸露的矿质土壤才能发芽并很好地存活。
Then the winter storms come and bury them in a blanket of snow.
然后冬天的暴风雨来了，把它们埋在一层雪里。
And then when the spring comes they have the ideal conditions… its warmer… it's really wet and those seeds will take off and become seedlings.
当春天到来的时候，它们就有了理想的条件，天气变暖，非常潮湿，这些种子就会脱落，长成幼苗。
From their birth among the ashes, these seedlings have become the groves we see today, with trees nearly 300 feet tall.
从它们在灰烬中诞生起，这些幼苗就变成了我们今天看到的树丛，树高近300英尺。
Over 3,000 years - think of what a giant sequoia has seen.
3000多年，想想巨红杉们都见证了什么。
How many times did Native Americans sit at the base, have lunch, look up and marvel at the crown of a sequoia.
印第安人有多少次坐在基地里，吃着午饭，抬头看着一棵红杉的树冠惊叹不已。
And now were doing it again today - it's humans just living their lives under these trees for millennia.
现在我们也在这样做——人类已经在这些树下生活了几千年。
