change from a waking to a sleeping state
同义词：fall asleep??/??dope off??/??drift off??/??nod off??/??drop off??/??doze off??/??drowse off
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。