他们召集士兵对抗入侵的军队。
他已经警告过他那些更狂热的将军们关于入侵的后果。
He has warned some of his more gung ho generals about the consequences of an invasion.
奥森•威尔斯使得许多美国人相信他们正遭到火星人的入侵。
Orson Welles managed to convince many Americans that they were being invaded by Martians.
很多旨在为野生动物提供庇护的国家公园经常受到偷猎者的入侵。
Many national parks set up to provide a refuge for wildlife are regularly invaded by people poaching game.
盟军部队明天开始演习，来展示一旦发生新的入侵，军队能以多快的速度集结起来。
Allied troops begin manoeuvres tomorrow to show how quickly forces could be mobilized in case of a new invasion.
什么样的入侵者会引发如此高级别的监控？
What kind of invader gives rise to such high-level monitoring?
这次入侵被称为诺曼征服，它很重要，原因有二。
The invasion is known as the Norman Conquest, and it is very important for two reasons.
如果被捕食者或者入侵的克林贡人攻击，他会怎么做？
What would he have done if attacked by a predator or an invading Klingon?
有时候，色彩的快速变换可以用来惊吓掠食者或威胁入侵者。
Sometimes a sudden shift in color can be used to startle potential predators or threaten intruders.
这只是对我们的免疫系统试图防御的潜在外来入侵者的分类介绍。
Just an introduction to the classes of potential foreign invaders that our immune system tries to defend us against.
围栏顶部是一个由900个监控摄像头组成的网络，用来探测入侵。
Perched on top of the fencing is a network of 900 surveillance cameras to detect intrusions.
提出的理论是，当未利用资源数量增加时，植物群落更容易受到入侵。
The suggested theory is that a plant community becomes more susceptible to invasion whenever there is an increase in the amount of unused resources.
希克索斯人从公元前1650年开始入侵埃及的尼罗河三角洲并统治它。
The Hyksos invaded the Nile Delta of Egypt and ruled it from 1650 B.C.
例如，外来植物的入侵可能会改变落叶的数量，从而改变对土壤的营养贡献。
For example, an invading nonnative plant could alter the quantity of leaf litter production, which would alter nutrient contributions to the soil.
我们不能把植物给忘了，没有它们事先入侵陆地，就不会有其他的迁徙发生。
We mustn't forget the plants, without whose prior invasion of the land none of the other migrations could have happened.
“机会主义者”必须不断入侵新的地区，以弥补被更具竞争力的物种取代的损失。
Opportunists must constantly invade new areas to compensate for being displaced by more competitive species.
历史学家认为，19世纪一再发生的蝗虫入侵改变了美国密西西比河以西的农业格局。
Historians credit repeated locust invasions in the nineteenth century with reshaping United States agriculture west of the Mississippi River.
许多生态学家说，这些入侵物种仅次于栖息地的丧失，是对全球生物多样性的最大威胁。
Next to habitat loss, these invasive species represent the greatest threat to biodiversity worldwide, many ecologists say.
如果一种外来植物入侵了地上的动植物群落，就会改变地上群落和地下土壤群落之间的联系。
If a nonnative plant species invades an above-ground community of flora and fauna, it can alter links between the native above-ground community and the below-ground soil community.
大自然保护协会还向众多入侵物种发起了宣战，从羊群到植物，再到具有攻击性的阿根廷蚁。
The Nature Conservancy has declared war on a multitude of invasive species here, from sheep to plants to the aggressive Argentine ant.
人类是终极入侵物种——当他们进入新的领地时，他们经常会取代已经生活在那里的野生动物。
Humans are the ultimate invasive species—when they move into new territory, they often displace the wildlife that was already living there.
不要太害怕，但是我们即将迎来家里蜘蛛的旺季。那为什么不把你家里的蜘蛛入侵变成一个游戏呢？
Don't look too horrified, but we're about to have a great season for house spiders. So why not turn your home's arachnid invasion into a game?
19世纪末，狗舌草被偶然引入新西兰，像许多入侵的外来物种一样，它很快就变成了一种有害生物。
Ragwort was accidentally introduced to New Zealand in the late nineteenth century and, like so many invading foreign species, quickly became a pest.
本土物种和外来物种都有可能成为入侵物种，因此当它们开始失控时，我们必须对它们进行监视和控制。
Both native and exotic species can become invasive, and so they all have to be monitored and controlled when they begin to get out of hand.
举个极端的例子，以单一作物为主的农田是如此不稳定，一年的坏天气或单一害虫的入侵可以摧毁整个作物。
To take an extreme example, farmlands dominated by a single crop are so unstable that one year of bad weather or the invasion of a single pest can destroy the entire crop.
在另一个极端，我们可能会地转移这个物种，但是在5至10年内，这个物种可能会激增并成为一个入侵物种。
At the other extreme, we might successfully translocate the species, but within five or ten years that species could proliferate and become an invasive species.
大约4万6千年前，在一种使用工具、高度智能的捕食者入侵后不久，澳大利亚主要的陆地生物发生了一些巨大的变化。
Something dramatic happened to Australia's dominant land creatures—somewhere around 46,000 years ago, strikingly soon after the invasion of a tool-wielding, highly intelligent predator.
随着确保罗马边境安全所需资源的增加，罗马领导人之间就如何最好地保护罗马领土不受入侵部落的侵扰这一问题产生了严重的冲突。
As the resources needed to secure Rome's borders increased, serious conflicts developed among Roman leaders over how best to protect Roman territory against invading tribes.
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