密度是由树木的生长方式决定的。
为什么冰岛的生长季节很短？
酚类物质还会使卵变小，这会减少第二年毛虫的生长。
Phenols also make the eggs smaller, which reduces the growth of the following year's caterpillars.
它们的根长得不深，所以永久冻土不会影响它们的生长。
Their roots don't grow very deep, so the permafrost doesn't interfere with their growth.
这些营养物质会对海星产生影响，因为它们会增加浮游植物的生长。
These nutrients have an effect on the starfish, because they cause an increase in the growth of phytoplankton.
不好意思，你说灌木的生长增加了，是指灌木变大了，还是变多了？
I'm sorry, when you say the growth of shrubs has increased, do you mean that the shrubs are bigger, or that there are more shrubs?
此外，当把这种抗体注射到黑猩猩身上时，它能抑制鼻病毒的生长，而在人类身上，它能减轻感冒症状的严重程度和持续时间。
Moreover, when the antibody was given to chimpanzees, it inhibited rhinoviral growth, and in humans it lessened both the severity and duration of cold symptoms.
没有充足的授粉，玉米的生长就会受阻。
Without sufficient pollination, the growth of the corn is stunted.
污水中的营养物的确会加快海藻的生长速度。
随着植物的生长及开始结果，它们将需要大量的水分。
As the plants grow and start to bear fruit they will need a lot of water.
有些土壤的碱性，实际上对某些植物的生长是过高的。
Some soils are actually too alkaline for certain plant life.
如不控制这种植物的生长，池塘和水道很快就要被阻塞。
The plant will soon choke ponds and waterways if left unchecked.
一位朋友从墨西哥寄给我一块根茎，我希望它能适应这儿的生长环境。
A friend sent me a root from Mexico, and I hope to naturalize it.
当作者看到马铃薯植株的生长时，她有什么感觉？
How did the writer feel when she saw the progress of the potato plants?
它的生长速度得非常缓慢，每年生长约15毫米。
在很多方面，一棵树的生长经历与我们自己的生活经历很相似。
In many ways, the life of a tree is similar to our own life experience.
植物的生长速度受到了许多因素的影响。
The growing speed of a plant is influenced by a number of factors.
它有助于指甲、发丝、骨骼和肌肉的生长。
这些有毒物质会限制毛毛虫的生长，减少雌蛾产卵的数量。
These noxious substances limit caterpillars' growth and reduce the number of eggs that female moths lay.
在过去的11年里，只有一年的天气不利于柑橘作物的生长。
In only one of these last eleven years was the weather unfavorable for growing citrus crops.
游戏也会刺激肌肉组织的生长，并能提供练习生存技能的机会。
Play also stimulates the development of the muscle tissues themselves and may provide the opportunities to practice those movements needed for survival.
自然发生的森林火灾甚至比山体滑坡或积雪更能促进白杨树的生长。
Even more than mountainside slides of mud or snow, naturally occurring forest fires promote the survival of aspen trees.
生态学家在研究野兔种群时发现，北美雪兔的生长周期大约为10年。
Ecologists studying hare populations have found that the North American snowshoe hare follows a roughly ten-year cycle.
其中一个项目涉及通过基因工程使烟草植物在缺水时保持叶子的生长。
One project involves tobacco plants genetically engineered to keep their leaves during water shortages.
迟来的积雪将有效的生长季节缩短至某一程度，使得幼苗无法自行生长。
Late-lying snow reduces the effective growing season to the point where seedlings cannot establish themselves.
水培法的应用范围超出了基础研究，因为它有助于冬季温室蔬菜的生长。
Hydroponics has applications beyond basic research since it facilitates the growth of greenhouse vegetables during winter.
《自然的馈赠》根据中国阴历和土壤的五种颜色来描绘作物的生长过程。
"The Gift of Nature" shows crop processes according to the Chinese lunar calendar and the five colors of the soil.
主要的生长介质，也就是植物吸收营养的来源，实际上是土壤，而不是水。
The primary growing medium, what the plants draw nutrients from, is actually soil, not water.
例如，生长素刺激细胞延伸的速度，促使芽和根生长，而抑制侧枝的生长。
Auxin, for instance, stimulates the rate of cell elongation, causes shoots to grow up and roots to grow down, and inhibits the growth of lateral shoots.
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.
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