求翻译：in another series of tests,the amount of alumina introduced to the reaction zone of the reactor was again varied to determine the impact of the amount of alumina on the particle size of the titanium dioxide.the amount of alumina was varied by changing the amount of aluminum chloride added to the TiCl4 reactant stream by the aluminum chloride generator.specifically,the aluminum and chlorine rates to the generator were varied.是什么意思？

待解决 悬赏分：1 - 离问题结束还有