The pressure gradient and velocity gradient of the extrudate in the central area were small, and the extrudate fllowed slowly in the central area, having high viscosity.是什么意思_The pressure gradient and velocity gradient of the extrudate in the central area were small, and the extrudate fllowed slowly in the central area, having high viscosity.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句