This theory is contrary to the widely held view
首先,表明新的理论与大众持有的view相悖
that the systems were deposited from metamorphic fluids
阐述的大众的view - “变质流体沉积形成the systems”
that is,from fluids that formed during the dehydration of wet sedimentary rocks
由that可看出,与上一句是平行结构,都用来解释the widely held view - “也就是,流体形成于潮湿沉积岩dehydration的过程中”
he recently developed theory has considerable practical importance.
新的理论的特点 - “他最近提出的理论具有重大的实践意义”
1 - 提出新理论与大众观点相悖；2,3 - 解释大众观点；4 - 阐述新理论的特点