Severing certain relationships, a predator could also be a prey, therefore the extinction of one might ultimately endanger our own as a species.

• 我觉得还是着重讲一下正因为人类对自然界的巨大影响（基本都是负面的），所以才有责任对濒危的油气是由于人类而濒危的物种进行保护。