英语 ⇄ 英语

英语 词库
twenty-twenty hindsight
	⇒ 20/20 hindsight
惯用语	perfect understanding of events only after they have happened (Etymology: From the term visual testing method 20/20 referring to normal visual acuity. wiktionary.org); the full knowledge and complete understanding that one has about an event only after it has happened (With 20/20 hindsight we now see where our strategy went wrong. merriam-webster.com)