Of the 7,000 alien species in the United States—out of a total of 150,000 species—only about 10% are 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.
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。
Ecologists generally define an alien species as one that people, accidentally or deliberately, carried to its new location.
生态学家通常把外来物种定义为人们偶然或故意带到新地方的物种。
A number of scientists question the assumption that the presence of alien species can never be acceptable in a natural ecosystem.
一些科学家质疑这样的假设，即在自然生态系统中，外来物种的出现是绝对不会被接受的。
"Only a small percentage of alien species cause problems in their new habitats," said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.
田纳西大学生态学和进化生物学教授唐·史密斯说：“只有一小部分外来物种会在新栖息地引发问题。”
"Only a small percentage of alien species cause problems in their new habitats,'' said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee.
“只有一小部分外来物种会在它们的新栖息地引发问题。”田纳西大学生态学和进化生物学教授唐·史密斯说。
Imagine that an alien species landed on Earth and, through their mere presence, those aliens caused our art to vanish, our music to homogenize, and our technological know-how to disappear.
想象一下，外星物种登陆地球，而他们的存在会让我们的艺术消逝，同化我们的音乐，也让我们的技术知识消失了。
What can be done about invasive alien species?
怎样处理外来入侵的有害物种？
This bizarre alien species has the unsettling appearance of an animated skeleton.
这个奇异外星种族的外表活像一具骷髅，令人坐立难安。
Conservation organizations bill alien species as the foremost threat to native wildlife.
保育机构把外来物种列为原生物种的头号威胁。
Davis and his colleagues had vastly played down the severe harm that alien species caused.
他还说，戴维斯和他的同事对外来物种的危害性轻描淡写。
Here are my top five reasons why an intelligent alien species will never invade our planet.
以下是五个为何外星高级生物不会入侵地球的主要原因？
Risk assessment is one of the most effective measures to prevent invasion of alien species.
外来物种风险评估是防止外来物种入侵的最有效手段之一。
With frequent human activities, invasion of alien species are becoming increasingly serious.
随着人类活动的日趋频繁，外来物种入侵也日趋严重。
One classic example is the Golden Apple snail - now cited as one of the most devastating invasive alien species.
这方面的一个经典案例就是金苹果蜗牛，即人们目前所称最具破坏力的侵入性外来物种之一。
Kent think he knows why: Perhaps only the wiliest of alien species survive the interstellar version of evolution.
肯特认为他找到了答案：或许只有最为狡诈的外星种族才能挺过从大陆文明向太空文明过渡的挑战。
So let's imagine that we suddenly stand face-to-face with members of an alien species. What would we do first?
那么来想象一下当我们突然面对某一外星物种的成员时，首先要做的是什么？
Some alien species are undeniably harmful, a fact that neither Dr. Davis nor others who share his view dispute.
有些外来物种无疑是有害的，无论是戴维斯，还是其他跟他有同样异议的人，都不否认这一事实。
Koth's species has been established as a Zabrak, making him of the same alien species as the deadly Darth Maul.
科思的种族被设定为扎布拉克人，跟致命的达斯·摩尔同出一族。
The peak came in 1996, when 585 new alien species were recorded worldwide, or more than 1.5 new alien species per day.
峰值出现在1996年，当时世界上有585个新外来物种被记录下来，或每天1.5个新外来物种。
At the moment there are movies about alien species trying to take something from us, either water, life, or even the planet.
在这个时候，有些视频讲述的是关于一些外星物种尝试从我们这里夺走某些东西，也许是水，生命，或者甚至是整个星球。
It is of great importance for all countries to prevent the invasion of alien species by application of laws and regulations.
通过法律规制外来物种入侵是各国防治外来物种入侵采取的重要手段之一。
MacKinnon says one of the most disturbing features of the problem of invasive alien species is that they are on the rise globally.
麦克·金南博士说，侵入性外来物种问题最令人不安的特点之一是，它们在全球范围内的数量不断增加。
In Yellow River Delta, the biological and ecological characteristics of an invasive alien species spartina were investigated.
对黄河三角洲外来入侵物种米草的生物学、生态学特性进行了观测和研究。
Since it's virtually impossible to eradicate them, it's vital for the country to seek ways to bring the alien species under control.
由于事实上不可能将这些外来物种彻底根除，因此重要的是南非应寻找控制它们滋生的办法。
The Census of Marine Life also points to the effect of so-called "alien species" being found in many of the world's Marine ecosystems.
海洋生物普查还指出了在世界上许多海洋生态系统中发现的所谓“外来物种”的影响。
Laws and regulations should be issued to control not only piranhas, but also other alien species, says an article in Legal Daily.
《法制日报》的一篇文章称，应该颁布相关的法律法规控制食人鱼以及其它一些外来物种。
Although not depicted in a story, The Essential Guide to Alien Species reveals that when Chirpa died, his position fell to Kneesaa.
虽然没有在故事中体现，但《异族基本指南》透露，彻帕去世后，妮莎继位。
Invasive alien species caused significant damage to natural ecosystem, agricultural production and human health throughout the world.
外来入侵生物已对世界各国的自然生态系统、农业生产及公众健康造成了严重危害。
Invasive alien species caused significant damage to natural ecosystem, agricultural production and human health throughout the world.
外来入侵生物已对世界各国的自然生态系统、农业生产及公众健康造成了严重危害。
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