graptolite
英['græptəlaɪt]
美['græptəlaɪt]
- n. 笔石纲
双语例句
- 1. 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.
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- 2. 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.
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