They say that portraying introduced species as inherently bad is an unscientific approach.
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。
A bumblebee draws nectar from an Arizona sunflower. Many bumblebee species are in decline, mainly because of habitat loss and likely due to introduced pathogens.
一只大黄蜂正在一株亚利桑那向日葵上吸取花蜜。很多种类的大黄蜂其数量都在减少，这主要归咎于栖息地的丧失和病原体的引入。
Household cats were introduced in North America by European colonists; they are regarded as an invasive species and have few natural enemies to check their Numbers.
欧洲殖民者向北美洲引入了家猫；家猫被视为入侵物种且几乎没有天敌。
These countries may not yet have developed the policies to deal with alien species, but they have an opportunity to learn those lessons before more alien species are introduced.
这些国家也许还未执行处理外来物种的政策，但是在更多的物种引进前，他们有机会学习那些教训。
These countries may not yet have developed the policies to deal with alien species, but they have an opportunity to learn those lessons before more alien species are introduced.
这些国家也许还未执行处理外来物种的政策，但是在更多的物种引进前，他们有机会学习那些教训。
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