对树木的大规模砍伐正在破坏环境。
The broadscale cutting down of trees is damaging the environment.
这种变化表现在树木的年轮中。
密度是由树木的生长方式决定的。
理由在变，但对更多树木的渴望是不变的。
The justifications change. The desire for more trees remains constant.
啊，有小虫在阳光下跳舞，还有树木的沙沙声，多么宁静啊！
Oh, how peaceful it was with the little gnats dancing in the sun and the rustling of the trees!
从森林到山坡上没有树木的苔原的过渡通常会十分突然和明显。
The transition from forest to treeless tundra on a mountain slope is often a dramatic one.
我通过呈现一个关于澳大利亚历史上的树木的戏剧或哑剧来告诉他。
I told him by presenting a play or mime about trees in the history of Australia.
此外，亨特和利波确信，定居者对岛上树木的损失并不承担全部责任。
Moreover, Hunt and Lipo are convinced that the settlers were not wholly responsible for the loss of the island's trees.
随着树木的生长，它在树干上增加了一层吸收空气中的化学元素而生成的膜。
As the tree grows, it adds a layer to its trunk taking up chemical elements from the air.
岛上有没有任何植物的沙丘，但也有古老树木的森林，美丽的花朵和一百多个湖泊。
On the island, there are sand hills without any plants, but there are forests with old trees, beautiful flowers and over a hundred lakes, too.
人们在针叶树和某些其它树木的硬化树脂中发现了昆虫，甚至发现了小型无脊椎动物。
Insects and even small invertebrates have been found preserved in the hardened resins of conifers and certain other trees.
这些蝙蝠能够区分这两种声音，不仅仅是通过树木的回声，而是通过任何平滑或粗糙的回声。
These bats can distinguish between the two, and not just with trees, but with any echo that comes in a smooth or rough shape.
他们用的是精心设计的密码，用树木的名称代表字母。
They used elaborate secret codes, as when the names of trees stood for letters.
科学家们将研究树木的多样性并观察哪些树木结果实。
The scientists will study the variety of trees and observe which are fruiting.
树冠层是大多数树木的上层部分。
为什么不同树木的枝叶不会相互触碰呢？
Why do the leaves and branches of different trees avoid touching each other?
其目的是改善旧金山街头树木的健康状况。
The purpose is to improve the health of street trees in San Francisco.
在测试开始时，他称了罐子、干土和树木的重量。
He weighed the pot, the dry soil and the tree at the start of his test.
树木的减少影响着地球上的每一个人。
“城市森林之友”（FUF）向人们发送时事通讯，以便在每个公民心中种下对树木的热爱。
The FUF sends newsletters to people in order to plant a love for trees in every citizen.
一想到要骑着自行车在这条尘土飞扬、没有花草树木的路上度过余生，他就觉得有些难过。
As soon as he thought he must spend his life riding the bike on the dusty road with no flowers or trees, he felt somewhat sorry.
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.
整个大陆和大部分的物种（占树木的数量的30%至50%）目前都受到了影响。
The entire continent and the majority of species are now affected: between 30% and 50% of the tree population.
森林里，树木的树荫为鸟类和其他依靠树木的花果而生长的特殊物种提供了家园。
The shade of the forest trees provides a home for birds and other special that depend on the trees' flowers and fruits.
加拿大的北极是一个广阔的、没有树木的极地沙漠，一年中大部分时间都被雪覆盖着。
The Canadian Arctic is a vast, treeless polar desert that's covered with snow for most of the year.
在亚马逊流域，有无数的狩猎采集者，他们生活在世界上最大的沿河生长的树木的枝干上。
There are numberless hunter-gatherers in Amazonia, living along branches of the world's largest river tree.
她的头发像在微风中的旗帜一样飘动，在清晨的晨光中，她似乎在黑暗树木的映衬下闪闪发光。
Her hair floats like a banner in the breeze and in the early morning light she seems to glow against a background of dark 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.
爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。
Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.
你可以通过数年轮来判断树木的年龄，但是作为树木生命的记载，年轮能说明的东西远不止于此。
You can tell the age of a tree by counting its rings, but these records of trees' life really say a lot more.
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