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.
所以它们这样做以防止其他青蛙入侵领地？
So they do that to keep other frogs from invading their territory?
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?
到1951年，在弗吉尼亚发现了这种微小的入侵者。
入侵一个地区的物种会危害生态系统、农业和人类健康。
Species that invade a territory can harm ecosystems, agriculture and human health.
然而，竞争之外的因素通常有助于解释入侵物种的成功。
However, factors other than competition often help explain invading species' success.
然而，竞争之外的因素常常有助于解释入侵物种的成功。
Nevertheless, factors other than competition often help explain invading species' success.
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.
非本地物种可能会在几十年内看起来无害，继而变得有入侵性。
Non-native species can appear harmless for decades, then turn invasive.
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.
更重要的是，非本地物种可能会在几十年内看起来无害，然后变得有入侵性。
What is more, non-native species can appear harmless for decades, then turn invasive.
在美国总共15万的物种中，有7000种外来物种，当中只有10%是入侵物种。
Of the 7,000 alien species in the United States—out of a total of 150,000 species—only about 10 percent are invasive.
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.
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.
3艘入侵军舰被一举击沉。
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