Hindsight is 20/20意思

"Hindsight is 20/20" is an English idiom that means that after an event has occurred, it is easy to understand or explain what happened. The phrase suggests that with the benefit of knowing the outcome, it is clear to see how things could have been done differently or how certain decisions led to the result. The "20/20" part refers to perfect vision, implying that with hindsight, one has perfect clarity about the past.

This expression is often used to acknowledge that it is easier to understand the causes and consequences of an event after it has happened, rather than before, when one is in the midst of it and does not have the advantage of knowing the full story. It is a way of recognizing thatindsight provides a clearer perspective than foresight.