我们正在做的另一件事是除掉生长在花园里的一些外来物种，并种回一些本地植物和树木。
The other thing we're doing is getting rid of some of the foreign species that are growing in the gardens and putting back some native plants and trees.
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.
他们说把外来物种描绘成天生的坏物种是一种不科学的做法。
They say that portraying introduced species as inherently bad is an unscientific approach.
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.
大西洋货轮还在带入外来物种——目前的数量已经达到185种。
Atlantic freighters still bring in foreign species—there are now 185.
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.
有一种假设认为是外来物种没有了天敌。
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.
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.
尽管做了许多尝试，但是我们还未获得外来物种和土著种多性状差异的综合观点。
Despite many attempts, a synthetic view of multi-trait differences between alien and native species is not yet available.
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.
对于三种植物品种之中的两种，外来物种的工作表现，与原生授粉者有的一比。
And for two of the three plant species, the invasive species were doing a comparable job to the native pollinators.
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.
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.
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.
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