在这种情况下，顶极群落会是最脆弱和最不稳定的，因为它们可能需要数百年才能恢复到顶极状态。
In that case, climax communities would be the most fragile and the least stable, since they can require hundreds of years to return to the climax state.
价格会随着收成、自然灾害和政治不稳定而波动；当价格上涨时，需要一段时间才能找到新的供应来源。
Prices fluctuate, in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available.
这种混合物是不稳定的，会迅速重新排列成一种稳定但仍然可逆的物质，这种物质被称为阿马多里产物。
This combination is unstable and quickly rearranges itself into a stabler, but still reversible, substance known as an Amadori product.
一项对九年级学生的研究发现，在九年级学生中，50%的友谊每个月都会发生变化，这表明友谊极其不稳定。
One study of ninth-grade students found that 50 percent of friendships among ninth graders changed from one month to the next, signaling striking instability in friendships.
但是，每10个美国人中就有4个在紧急情况下拿不出400美元，这个数据常被引用，理由也很充分，即经济不稳定跨越了种族、性别和地域因素。
But the fact that 4 in 10 Americans can't come up with $400 in an emergency is a commonly cited statistic for good reason: economic instability stretches across race, gender, and geography.
他认为失业会引起社会不稳定。
经济战线上的情况显得不稳定。
这支队正处于赛季中期的不稳定状态。
看来天气有些不稳定。
劳工部的数字突出显示了经济复苏的不稳定。
The Labour Department figures underscore the shaky state of the economic recovery.
那些男孩子无法发动那辆性能不稳定的摩托车。
这种强劲的民族主义势力是一股强大和潜在的不稳定的力量。
This kind of fierce nationalism is a powerful and potentially volatile force.
她不情愿地援助了欧元区一些不稳定的成员。
如今不稳定的经济可能会催生更多这种小窍门。
Today's shaky economy is likely to produce many more such tricks.
不幸的是，他使用的聚氨酯泡沫本身就不稳定。
Unfortunately, the polyurethane foam he used is inherently unstable.
他们生活在不稳定的平衡中，并且这是地球上最艰苦的环境之一。
They live in precarious balance and one of the toughest environments on earth.
公司贷款和部分消费者信贷，例如信用卡和汽车贷款，都不稳定。
Corporate lending and parts of consumer credit, such as credit cards and car loans, are wobbly.
在这个原子钟的装置里，它们还是太不稳定了，不能靠自身确保时间。
At the esoteric edge of the timekeeper's craft, they are too wobbly to keep time by themselves.
对选民来说的确如此。但是，将企业建立在政府补贴的基础上也是不稳定的。
That's true for voters. But government subsidy is a wobbly foundation on which to build a business.
它被广阔的海洋包围，也很脆弱，但南极专家对它的不稳定程度存在强烈分歧。
Surrounded by open ocean, it is also vulnerable, but Antarctic experts disagree strongly on just how unstable it is.
相反，随着直线下降的收入和不稳定的工作，不幸福的夫妻往往负担不起离婚。
Rather, with incomes plummeting and insecure jobs, unhappy couples often couldn't afford to divorce.
这个地方的名字来源于克里克印第安语，指的是沼泽中常见的不稳定的浮动岛屿。
This place gets its name from a Creek Indian word, which refers to the unstable floating islands that are common within the swamp.
在风能不稳定的一些地区，需要供电事业公司或者能量储存系统来提供备用电能。
In areas where the wind dies down, backup electricity from a utility company or from an energy storage system becomes necessary.
大多数政治家认识到投资科学和国家经济实力的关系，但对研究资金的投入一直不稳定。
Most politicians recognize the link between investment in science and national economic strength, but support for research funding has been unsteady.
当我们上飞机的时候，通常已经很累了，而拥挤的空间和不稳定的网络使工作更具挑战性。
We are usually tired already by the time we get on a plane, and the crowded space and unstable internet connection make work more challenging.
如果对它们的数量进行时间记录，就会发现它是很不稳定的——以不规则的周期急剧上升下降。
If their population is tracked through time, it will be seen to be particularly unstable—soaring and plummeting in irregular cycles.
然而，尽管它们被誉为艺术文学应该追求的典范，但荷马的杰作也一直是学术届不稳定的根源。
However, even as they were celebrated as the models to which art literature should aspire, Homer's masterworks had also long been the source of scholarly unease.
在重质或不稳定的土壤和陡峭的斜坡上，浇注混凝土挡土墙效果良好，让其他墙成为不明智的选择。
Poured concrete retains walls work well in the heavy or unstable soil and steep slopes, making other walls inadvisable.
这些因素包括混乱的大气波动、相对较慢但同样不稳定的海洋活动、地表变化，以及冰雪的覆盖范围。
These factors include the chaotic fluctuations of the atmosphere, the slower but equally erratic behavior of the oceans, changes in the land surfaces, and the extent of ice and snow.
数学模型也揭示了食物网可能是不稳定的，顶级肉食性动物的微小改变会对整个生态系统产生巨大影响。
Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems.
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