1 m3 of catalyst particles in a fluidized reactor may have a surface area of 30,000m2, equivalent to a sphere with a diameter of almost l00m!是什么意思_1 m3 of catalyst particles in a fluidized reactor may have a surface area of 30,000m2, equivalent to a sphere with a diameter of almost l00m!在线翻译_英语_读音_用法_例句