But as we age, this process slows down.

但随着我们年龄渐长， 细胞再生长过程变缓。

And without the photosynthesis needed to support additional growth, the tree instead turns its resources towards existing branches.

没有了再生长所需光合作用，树就营养送到现有枝叶上了。

Like observing whether plants will grow in the low gravity and exploring whether water or other resources lie at the moon's poles.

比如，研究否植物能够再低重力中生长和探索月球极点否有水或者其他资源存。

But, it seems like a lot of work, working in the fallow field and the current field, planting new plants, waiting for them to grow.

但，这似乎一项繁重工作，既要休耕地里工作，还要现地里工作，种植新植物，再等待们生长。

If rabbits ate too many plants, the plants would not be able to grow back fast enough, and other animals that need the plants would not have enough to eat.

如果很多植物都被兔子给吃了，植物就可能不能再生长出那么多，其他需要吃植物动物将不会有足够植物吃。

This tree is at a minimum 1,000 years old, and has survived many, many, many previous fires and should have lived another 1,000 to 2,000 years, is dead, is gone.

这棵树至少有一千年历史，以前很多火灾中都存活了下来，本应该再活一到两千年，但现已经死了，不会再生长了。

No sequoia on record has been able to grow taller than 130 meters—and many researchers say these trees won't beat that cap even if they live for thousands of years to come.

现有记录上，没有红杉高过130米——很多研究者说，们不可能超过这个高度即使们再生长上千年。

These are the ones that burn over 100, 000 acres with the intensity that can threaten aquifers and biodiversity, and even cause forest conversion, in which trees are so damaged that they just don't grow back.

这些火灾烧毁面积超过 100，000 英亩，其强度可能威胁到含水层和生物多样性，甚至导致森林转变，树木受到严重破坏，无法再生长。