fore-set bed是什么意思

用法例句

During the study of sequence stratigraphy in thenorthpart of Tarim Basin，a series ofhigh frequent progradational sequences have been discoveried in the seismic sections ofCambrian and Carboniferous.

在塔里木盆地北部的层序地层研究中，在寒武系、石炭系等许多层位的地震剖面上，发现了一系列高频前积层序。

Based on per-winter positive accumulated temperature in three regions of Huang-Huai Winter Wheat Area and Baoding of northern winter wheat area during 1997-2006,the suitable planting dates of winter wheat were preliminarily studied.

以黄淮冬麦区的邯郸、石家庄、衡水和北部冬麦区的保定1997—2006年期间的小麦冬前积温为依据,采用积温指标法对冬小麦的适宜播期进行了研究。