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 .
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 .
