取向有序 meaning in Chinese

directional ordering

The characteristic of nematic phase is orientation order of the molecule long axis
向列相的特征是分子长轴取向有序，可用标量序参量s表示。
When liquid crystal ( lc ) is in smectic - a ( sa ) phase , its molecules disperse in layers ( sandwich ) and the molecular long axis tropism is in some order and the director is perpendicular to the layers
液晶近晶a相，分子质心按层状分布(有层状结构) ，分子长轴取向有序，指向矢垂直于层面。用三个序参量，，描述。