1(Chiefly poetic and literary) the spring or source of a person's innermost feelings, thoughts, etc. (chiefly in plural).
2Something regarded as the essential source of a concept, impulse, activity, etc.
Mid 17th century.
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。