a deficiency of moisture (especially when resulting from a permanent absence of rainfall)
同义词：aridity??/??aridness
a physiological need to drink
同义词：thirst
strong desire for something (not food or drink)
同义词：hunger??/??hungriness??/??thirst
英汉双解词典包含3185865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。