primary stages

基本解释

In the primary stages of their civilization, they had no metal tools.
在他们文明的最初阶段没有金属工具。
The most basic primary school English as a foreign language education, with special teaching object - is in the primary stages of learning their mother tongue.
小学英语作为最基础的外语教育，有着特殊的教学对象——正处在母语学习阶段的小学生。
At present, the focuses are archaeological research, regional study, and periodical division, which are primary stages. It has not got the level of synthetic study.
目前，对它的研究还处于田野考古学研究、区域研究和分期断代研究这样的基础研究上，还没有上升到综合研究的层次。