但是有些树木生长速度很快。
在地球上，人们认为，表明太阳黑子周期最可靠的迹象之一是树木的生长速度，就像树干横截面上可见的年轮一样。
On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.
研究发现，城市树木的碳循环速度和生长速度几乎是乡村树木的四倍。
It was discovered that rates of carbon cycling and growth rates among city trees were nearly four times faster than those in the countryside.
这一个长廊由生长速度很快的杂交白杨形成，位于加利福尼亚的一个林场，树木形成了一个哥特式大教堂的形状，这种结构是经过漫长的时间，对人类不屈不挠的精神的表白。
This long gallery of hybridized, fast-growing poplar trees on a Californian tree farm is reminiscent of a Gothic cathedral, a structure that testifies to the human spirit's perseverance through time.
酸雨现象不但导致湖泊酸性提高，使许多鱼类繁殖能力下降；而且随着土壤里酸性物质的增加，树木的生长速度开始放慢，对疾病的抵抗力下降。
The result is increased acidity in lakes, which has curtailed the ability of many fish to reproduce, and in the soil, which has slowed the growth of trees and increased their vulnerability to disease.
如果你今天走到森林里去，可能会看到高科技的树木——这些树通过基因改良促进了生长的速度或提高了木材的质量。
If you go down to the woods today, you may meet high-tech trees genetically modified to speed their growth or improve the quality of their wood.
早在七十年代，韩国村民就过度砍伐树木做燃料，森林生长的速度赶不上砍伐的速度，甚至连落叶都用来做燃料。
By the early 1970s, villagers in South Korea were cutting down trees for fuel faster than the woodlands could re-grow. Even fallen leaves were burned as fuel.
早在七十年代，韩国村民就过度砍伐树木做燃料，森林生长的速度赶不上砍伐的速度，甚至连落叶都用来做燃料。
By the early 1970s, villagers in South Korea were cutting down trees for fuel faster than the woodlands could re-grow. Even fallen leaves were burned as fuel.
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