百度了一下这几个词的back ground，发现在这里
The UC Davis team that will do the work consists of CODA Holdings Raises $76 Million in Series D Initial Closing CODA Holdings, a leading developer of lithium-ion advanced battery systems and all-electric vehicles, announced the initial closing of a Series D preferred investment round totaling $76 million, bringing the company's total invested capital to more than $200 million.

a series D preferred investment round似乎应该翻译成：一轮D系列首选投资