求翻译：as shown by Table 3,a significant shift in the particle size of the titanium dioxide results from increasing the amount of alumina imparted to the titanium dioxide from zero or a low amount to 0.79 weight percent.a very significant decrease in the particle size of the titanium dioxide was seen at an alumina amount of 1.7-2.0 weight percent.the increase in the amount of alumina together with the addition of a particle size control agent to the TiCl4 reactant stream in accordance with the invention resulted in a very significant shift in the particle size of the titanium dioxide是什么意思？

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