smell blood idiom
发现有机可乘；意识到可以乘人之危
to recognize an opportunity to take advantage of someone who is in a difficult situation
When she smells blood, you don't get a second chance. 当她意识到机会来了时，你就没有第二次机会了。
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。