vestigial organ

基本解釋

The ESB becomes the equivalent of a human appendix for the IT department, a vestigial organ within the topology of deployed applications.
ESB 成了 IT 部門可有可無的東西，也成了已部署的應(yīng)用程序拓撲中的累贅。
Because these structures can be traced back through the ancestors, they essentially serve as a marker of evolution; no organism can have a vestigial organ that hasn’t been found in its forefathers.
由于這些結(jié)構(gòu)的出現(xiàn)可以追溯到各代祖先，所以它們可以作為進化的標志；沒有一個生物體身上的退化器官是祖先沒有的。