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.
它是树木的中心部分。
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.
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。
树木的减少影响着地球上的每一个人。
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.
鉴于病毒的存在，树木的防御策略显然适得其反。
Given the presence of the virus, the trees' defensive tactic apparently has backfired.
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.
最严重的是不断增加的死亡率，尤其是成熟树木的死亡率。
The most serious is increasing mortality, especially of mature trees.
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.
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.
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