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1·Plenty of experiments, albeit accidental ones, have already demonstrated that subtracting even one species can change an eco-system.

许多实验，除个别例外，已证明即使是一个物种的减少也能改变一个生态系统。

2·Lewison said that long-lived species are particularly affected by accidental entanglement in fishing lines, because these species take so long to reproduce.

刘易森称，长命物种很容易被钓丝意外缠住，因为这些生物需要很长时间才能繁殖。

3·Introductions of new species, both accidental and deliberate, over the past few centuries show the problem.

在过去的几百年里，不管是有意地还是无意地引进新物种，都暴露出一些问题。