1874Maskelyne in Geol. Soc. Lond. XXX. 409 Vaalite..occurs in hexagonal prisms, the angles of which are nearly 60° and 120°.
英语词典包含277258条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。