propaedeutic stratigraphy[地质] 基础地层学;初步地层学
propaedeutic prospecting stage初步勘探阶段
propaedeutic survey stage初步普查阶段
N(名词) preparatory instruction basic to further study of an art or science (艺术或科学的)预备教育
ADJ(形容词) of, relating to, or providing such instruction 预备教育的