例句 /

Pe trologists, both at home and abroad have spent a lot of time on the classification of pyroclastic rocks, and successively put forward the classification of pyroclasts, the petrographic and the petrogenetic classification of pyroclasic rocks.

Pe trologists, both at home and abroad have spent a lot of time on the classification of pyroclastic rocks, and successively put forward the classification of pyroclasts, the petrographic and the petrogenetic classification of pyroclasic rocks.

长期以来,火山碎屑岩的分类研究受到了国内外学者的重视,先后提出了火山碎屑物、火山碎屑岩岩性和火山碎屑岩成因分类。