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.
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.
我们穿过了没有树木的荒地。
就像生活在没有树木的热带草原，你发现水果不够了，动物稀缺。
It's like living on the savannah and discovering you don't have enough fruit and the animals are scarce.
山谷被茂密的森林覆盖，但上层的斜坡上是比较开阔的树木林地，并且很多山顶和山脊上都是没有树木的。
The valleys are thickly forested, but the upper slopes become open woodland and many of the peaks and ridges are treeless.
雪落在黑暗的中央平原的各个角落，落在没有树木的小山上，轻柔地飘落艾伦沼泽上，再往西，轻柔地飘落在香农河奔流翻涌的黑色水波中。
It was falling on every part of the dark central plain, on the treeless hills, falling softly upon the Bog of Allen and, farther westward, softly falling into the dark mutinous Shannon waves.
在森林中，视觉信号只能在没有树木遮挡的地方在短距离内被看到。
In forests, visual signals can be seen only at short distances, where they are not obstructed by trees.
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.
来自其他研究的证据表明，没有火灾会导致植物物种丰富性显著减少，通常还会伴随着树木密度的增加。
Evidence from other studies suggests that exclusion of fire results in markedly decreased plant-species richness, often with an increase in tree density.
树木没有被复制，只是木材，特别是木材的密度。
The trees weren't replicated, just the wood, specifically the wood's density.
例如，如果没有树木来吸收太阳的辐射并提供树荫，那么太阳辐射就会完整地到达地面。
For instance, without a tree to absorb radiation from the Sun, to offer shade, the full intensity of that radiation reaches the ground.
你有没有听过有一种树木，它们是陆地动物和海洋生物的家园？
Have you ever heard of the trees that are homes over animals both on land and sea?
人口不断增加所带来的压力促使人们大量砍伐木本植物，因此许多城市和城镇周围的大片地区已经完全没有树木和灌木了。
The increased pressures of expanding populations have led to the removal of woody plants, so that many cities and towns are surrounded by large areas completely lacking in trees and shrubs.
如果没有树木吸收地面中的水分，土壤一直会比周边的树林更加湿润。
Without a tree to soak up moisture from the ground, the soil remains wetter than in the surrounding forest.
砍伐的树木被算作收入，但被耗尽的森林资源却没有计入损失。
The trees cut down are counted as income but no subtraction is made for using up the forests.
对于为什么树线以上的树木会突然停止生长，至今还没有一个公认的解释。
There is still no universally agreed-on explanation for why there should be such a dramatic cessation of tree growth at the upper timberline.
你有没有听说过有一类树木是陆地动物和海洋动物的栖息地？
Have you ever heard of the trees that are homes to animals both on land and sea?
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.
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.
尽管树木年轮表明当时发生了气候剧变，却没有任何数据解释这次剧变的原因。
But while the tree rings show variability, there is no data for why these climate changes occurred.
这些房子彼此挨在一起，房屋之间没有留下空间，但天井给树木、花草、喷泉及居民的隐私留下了空间。
Such houses are built side by side with no openings between them, but the patios offer space for trees, flowers, and fountains and ensure privacy for the occupants.
但这个院子里满是尘埃，而且没有树木，看上去不是令人愉快的排队等候的地方。
Dusty and treeless, the courtyard seemed like an unpleasant place to stand in line.
第二棵树面带微笑地被送到造船厂，但是，那天没有建造什么坚固的大船，而是，原本粗大的树木，被锯开并敲打成了一艘简易的渔船。
The second tree smiled when the woodcutter took him to a shipyard, but no mighty ships were being made that day. Instead, the once strong tree was hammered and sawed into a simple fishing boat.
岛上森林自生自灭。现在没有人来清理这些老朽的树木来生火。
Forest on the islands grows and dies by itself. Nowadays nobody chops or clears the age-old trees with fire.
为了获得认证，Rimba Raya需要证明雨林确实受到真正的威胁：付出碳信用额来保护根本就不存在危险的树木和泥炭地是没有意义的。
To win certification, Rimba Raya has to show that the forest is under genuine threat: no point in giving carbon credits for conserving trees and peatland that were not in danger anyway.
这些树到底有什么免疫系统，使得它在其他树木都没有存活下来的时候，它存活下来了？
What does this tree's immune system have in it that it has survived when other trees haven't?
这些树到底有什么免疫系统，使得它在其他树木都没有存活下来的时候，它存活下来了？
What does this tree's immune system have in it that it has survived when other trees haven't?
应用推荐