A brief jet or stream of gas escaping through a layer of ice, rock, etc.; a deposit of material left by such escaping gas.
Late 19th century; earliest use found in Encyclopaedia Britannica.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。