flog a dead horse waste energy on a lost cause or unalterable situation.
1971Cabinet Maker & Retail Furnisher If this is the case, we are flogging a dead horse in still trying to promote the scheme.
英语词组固定搭配大全包含15956条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。