graptolite是什么意思
英文词源
- graptolite (n.)
- fossilized colonial animal from the Cambrian and later, 1838, from Modern Latin graptolithus, literally "written-stone," from Greek graptos "engraved, written, painted" (verbal adjective of graphein; see -graphy) + lithos "stone" (see litho-). So called because the fossils resemble pens. Related: Graptolitic.
实用例句
- 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.来自互联网
- 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.来自互联网
