他认为树木需要水和空气中的气体来生长。
He decided that trees use water, and a gas from the air, to grow.
随着温度的升高，树木需要更多的水，但是长期的干旱剥夺了它们的水分，使得整片森林很容易被砍伐，变成了农田。
Trees need more water as temperatures rise, but the prolonged droughts have robbed them of moisture, making whole forests easily cleared of trees and turned into farmland.
另一个关键的问题与第一个问题——即树木的大小问题有关：它需要到离水多远的地方获得木材？
Another critical issue and it's related to the first, to the size issue, is how far from the water should it go to get trees.
另一个关键的问题与第一个问题——即树木的大小问题有关：它需要到离水多远的地方获得木材？
Another critical issue and it's related to the first, to the size issue, is how far from the water should it go to get trees.
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