句子成分分析“But such predation on a dominant or potentially dominant species occurs i

tucaozhuanyong

请大牛帮忙对“But such predation on a dominant or potentially dominant species occurs in systems that do as well as in systems that do not have species that play keystone roles.”进行一下句子成分分析指导，谢谢啦

babybearmm

But such predation on a      (1.dominant)  OR  (2.potentially dominant) species
occurs
  (A.   in systems that do)   AS WELL AS  (B.  in systems that do not)
       have species that play keystone roles




Fact 1. There are two kinds of systems: A. systems that do have ...    ; B. systems that do not have species that ...
Fact 2. Such predation occurs in both kinds of systems.

请大牛帮忙对“But such predation on a dominant or potentially dominant species occurs in systems that do as well as in systems that do not have species that play keystone roles.”进行一下句子成分分析指导，谢谢啦

-- by 会员 tucaozhuanyong (2012/7/21 3:48:28)

tucaozhuanyong

谢谢你