同义词
1)primary sedimentation,原生沉积2)origion sediment of 137Cs fallout,原生沉积物3)sedimentary environment,原生沉积条件4)primary sedimentary structures,原生沉积构造5)the primary sedimentary structures of a fifth category,第五类原生沉积构造6)microbially induced primary sedimentary structure,微生物参与形成的原生沉积构造
