graptolite

graptolite读音音标

英[\\\'græptəlaɪt]

美[\\\'græptəlaɪt]

基本意思释义

n.笔石（古无脊椎动物，现存化石）

短语及实用例句

These provide base for the correct measurement and valuing of graptolite reflectivity.

从而为笔石反射率的正确测定和取值奠定了基础.

The black graptolite shale facies indicate a deep - water, half enclosed and anoxic sedimentary environment.

中奥陶世黑色的笔石页岩为典型的半封闭缺氧的深水沉积环境,反映了海水逐步加深,水体也变得相对宁静.