Cross-Sectional: The sample of elements is measured only once. This shows you a snapshot of variables at a point in time (e. g. , market survey).

横截面数据：成分数据只测量一次。这展示你的变量在一个时间点的快照（如：市场调查）。

youdao

The sample yield and the fugitive constituent decreased with time, but the softening point and the content of toluene insoluble components increased.

随着反应时间的延长，样品收率、挥发份产率不断降低，而软化点和甲苯不溶物含量则不断升高。

youdao