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.
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% 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.
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.
人类身体携带有几百种细菌物种，这些细菌负责各种有益健康的例行工作，从帮助消化到帮助免疫系统确认外来入侵物。
The human body hosts hundreds of bacterial species that perform various salubrious housekeeping chores, from aiding digestion to helping the immune system identify foreign invaders.
最后得到的名单中包括21种被广泛认可的入侵物种和18种用于对照的非入侵性外来物种。
The result was a list of 21 species widely agreed to be invasive and, for comparison, 18 non-invasive aliens.
来自中国和美国的研究小组指出，中国外来动物入侵物种的数量从1990年到2003年增加了30%，达到76种，而植物入侵物种在1995年至2003年翻了三倍。
The China–US team say that invasive animal species increased from 1990 to 2003 by more than 30 per cent to 76 species, and invasive plant species tripled between 1995 and 2003.
在世界上100种影响最大的外来入侵物种中，尼罗河鲈鱼是其中之一，它于20世纪50年代被引入到东部非洲的维多利亚湖。由于鲈鱼的肆虐，环境混乱的窘境一直延续至今。
One of the 100 most invasive species in the world the Nile perch was introduced to East Africa's Lake Victoria in the 1950s, and has wreaked environmental havoc ever since.
虽然小龙虾在别人的眼中只是一种外来入侵物种，但在中国人的眼中，他们却是一道非常美味的佳肴。
Although crayfish are regarded as an invasive pest, they are a kind of delicious food in Chinese people eyes.
外来种的入侵机制是其中重要的科学问题。
The mechanism for the invasion is the key scientific issue among others.
对植物外来种的入侵及对生态系统的影响进行综述与分析。
The invasions of exotic plants and their effects of ecosystems were reviewed and analyzed.
外来种的入侵性和生境的可入侵性是研究生物入侵机制的两个关键因素。
Exotic invasiveness and community invisibility are two key factors to study the mechanism of biotic invasion.
入侵检测作为一种最重要的主动防御技术不但能检测外来的攻击还能检测来自内部的入侵。
Intrusion detection which is the most important initiative recovery security technology can detect not only the outer but also the inner intrusion.
农业部一位官员本周一称，中国正受到超过400种入侵的外来物种的威胁，每年给中国造成的经济损失高达数十亿元。
China is threatened by more than 400 invasive alien species, which has caused billions of yuan of economic losses, an agricultural official said Monday.
红脂大小蠹是我国一种危害油松等松树的外来入侵物种。
Dendroctonus valens is a dangerous insect pest of several pine species in China.
企业免疫系统的应答机制解释了企业抵御外来入侵病毒的整个过程，从一个全新的视角为企业提供了一种新的管理机制。
The response mechanism of enterprise immune system can explain the whole process in which the enterprise fights against invading virus, and provide the enterprise with a new management mechanism.
目的说明我国媒介蝇类区系成分中外来种的入侵问题及人类活动导致的媒介蝇类入侵的重要性。
Objective to describe the invasion of exotic species into the composition of fly fauna in China and the significance of human-induced invasion of fly vectors.
本论文采取了野外调查和室内试验相结合的研究方法，对外来种火炬树是否对引种地生态环境构成生物入侵的问题进行了研究。
In this paper, the methods of the field investigations and laboratory testing were applied to come to a conclusion if Rhus typhina causes the biological invasion for the local environment.
该类害虫在入侵时以及入侵后在种群生物学和行为遗传学上发生了一系列的变异，使其成为一种入侵成功的外来生物。
The genetic changes during or subsequent to introduction have led to alterations in its population biology and behavioral genetics; these, in turn, have promoted the invasive success of RIFA.
构建包含基本生物学和生态学信息的外来物种数据库不仅对理解生物入侵分布格局至关重要， 同时也是制定外来种管理策略和解释生物入侵过程的重要一步。
A database of alien flora is important for better understanding the patterns of plant invasions, as well as explicating the mechanisms promoting plant invasion at local, regional and global scales.
生物入侵是一个适应性进化的过程，天然杂交与遗传渐渗可以改变外来物种对环境的适应性并提高其入侵能力，使其进化成为入侵种。
Biological invasion is a process of adaptive evolution in which hybridization and introgression play an important role in promoting invasive species by changing their invasiveness.
外来入侵植物来源于世界各地，以来源于美洲居多，有87种，占76.3%。
The plants are all from aboard and 87 species (76.3%) are mainly from America.
外来入侵植物来源于世界各地，以来源于美洲居多，有87种，占76.3%。
The plants are all from aboard and 87 species (76.3%) are mainly from America.
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