没有合适的生长条件，树木就不能长得很高大。还有一些证据表明，在世界气候温暖的时候，尤其是在原本已经很温暖的环境里，树木的生长可能会放缓。
Without the right growing conditions, trees cannot get really big, and there is some evidence to suggest tree growth could slow in a warmer world, particularly in environments that are already warm.
从一方面来说，一个只有零星树木的世界与很多树木聚集成为森林的世界是不同的，但从另一方面来说，到底有没有一个界限，超过了多少树木，就可以称作是森林呢？
On the one hand, again, a world with scattered trees is different from one where they're collected into forests; but on the other, what exactly is a forest over and above its trees?
不幸的是，今天世界上很多地方人们没有意识到树木的重要性。
Unfortunately, nowadays in many parts of the world lots of people fail to realize the importance of trees.
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