1862Johns Brit. Birds 331 So close an imitation may be produced, that a genuine cooer may be beguiled into giving an answer.
1869Daily News 30 Oct., No hawk could swoop on such billers and cooers as these.
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。