什么是外来物种,外来物种就一定有害吗?国内物种跨区域调动是否同样存在危险?面对陌生的动植物,普通公众除了时刻警惕还需要科学判断——北京市民因食用凉拌螺肉而感染广州管圆线虫病,广西250万亩稻田遭袭击……近期,有关福寿螺惹祸的消息频见报端,其再次提醒人们,要慎重引进外 What are alien species, alien species will be harmful? Domestic species cross-regional mobilization is also dangerous? Faced with unfamiliar plants and animals, the general public in addition to vigilance also need to make scientific judgments --Beijing residents infected with cold conch of meat and Guangzhou Tubercular nematodes, Guangxi 2.5 million mu of paddy fields were attacked ... ... Recently, the news about the troubled snails frequently reported, which once again remind people to carefully introduce the outside