事后诸葛亮
monday morning quarterbacking;criticize or pass judgment from a position of hindsight;be wise after the event
这仅仅是～罢了。These are the judgments of hindsight,however./～好当。It is easy to criticize with the benefit of hindsight.
事后诸葛亮shì hòu zhūɡě liànɡ
事情过去以后，才悟出道理和解决的办法。形容一切都晚了。be wise afterwards, prophesy only after the event