对野外调查样地进行逐步聚类的翻译：The field survey sample plots are gradually clustering 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Kind of field investigations carried out step by step clustering

The field survey sample plots are gradually clustering

Carries on gradually the cluster to the open country investigation type place

The field survey conducted in the same way gradually clustering

The field survey sample plots are gradually clustering