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入侵一个地区的物种会危害生态系统、农业和人类健康。
Species that invade a territory can harm ecosystems, agriculture and human health.
另一个缺点则是,这种计划的副作用在很大程度上是未知的,而且有可能是可怕的。 比如说,在这种被改变了的生态环境中,可能会有杂草类的无种能从中得益以对海洋造成更大的危害。
Another drawback is that the side-effects are largely unknown and potentially horrible if, for example, a “weed” species were to take advantage of a changed ecosystem.
不然,这对动物们太不公平了,而且一旦他们被释放出来,也许对城市自身的生态系统造成危害。
Otherwise it's unfair to the animals, and it might be harmful to the city's local ecology if they were set loose.
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