英语句子求大神们帮忙看下,谢谢!Located in tropical areas at low altitudes,savannas are stable ecosystems,some wet and some dry consisting of vast grasslands with scattered trees or shrubs.这句话里面为什么要用consisting of这样

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英语句子求大神们帮忙看下,谢谢!
Located in tropical areas at low altitudes,savannas are stable ecosystems,some wet and some dry consisting of vast grasslands with scattered trees or shrubs.
这句话里面为什么要用consisting of这样的现在分词?

consisting of 是用来修饰主语 savannas 的,因此要用现在分词,相当于形容词性,与some wet and some dry 并列
句意是:位于热带低纬度地区,稀树草原是稳定的生态系统,半干湿并且由大面积的草原和零星的树和灌木组成