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.