sound of something in rapid motion
同义词：whirr??/??whirring??/??birr
make a soft swishing sound
同义词：whizz??/??whiz??/??whirr??/??birr??/??purr
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。