Shale

(noun.) a sedimentary rock formed by the deposition of successive layers of clay.

录入:凯文

• The best kind of gas made from mineral substances is produced by the distillation of a bituminous shale, called Boghead coal, which was discovered a few years since in Scotland. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
• The shop was built on a shale hill, and when the engine was started the whole hill shook with the high speed revolutions. 鲁伯特·萨金特·荷兰. 历史性发明.

校对:齐利格