Projection pursuit cluster ( PPC ) is the colligation of projection pursuit and unstratified cluster method . In the time it was attempted to stratify the datum and search low-dimensional representative characteristics of clustering structure .

投影寻踪聚类（PPC）是投影 寻踪 和 非 分层聚类方法的综合，它同时尝试分类数据和寻找聚类结构的低维有代表性的特征。

The jet behavior of a multi nozzle head scaled from an existing engineering was investigated experimentally in a steady unstratified receiving water body .

在 没有 密度 分层 的 容 泄水体 条件下，对某污水 排 海工程多孔喷头的射流特性进行了实验研究。

Unstratified soil deposited by a glacier ; consists of sand and clay and gravel and boulders mixed together .

冰河沉淀 形成 的 不 分层的土壤，由沙、粘土、砂砾和漂石混合 而成。

After a winter period the effects of seed shell and seed coat on the breathing of stratified seeds and unstratified seeds were tested .

对不同 采收期的 山楂种子进行 层 积 处理，经过一个冬季后，测定 层 积 与 未 层积种子的种壳、种皮对呼吸的影响。