The strange thing is , they may have parasites to thank .

因此让人感到奇怪的是，它们似乎还要感谢这些寄生物。

In particular , they are responsible for the removal of dangerous parasites such as the phorid fly .

它们特别负责清除危险的寄生物，例如帚蝇。

Diverse ecosystems are more resilient in the face of new parasites , and a business with apparently wasteful experiments around the edges can sometimes benefit if the economic climate suddenly changes .

在遭遇新的寄生物种侵扰时，多样化的生态系统更容易复原；进行过大量看似无用的边缘实验的企业，在经济环境急剧变化时或许能从中获益。

For the bugs are neither parasites nor passengers . They are , rather , fully paid-up members of a community of which the human " host " is but a single ( if dominating ) member .

因为这些生物既不是寄生物也不是过客，它们是一个社区的正式成员，人是这个社区唯一的（可能还是占统治地位）“宿主”。