Hindsight is the ability to understand and realize something about an event after it has happened, although you did not understand or realize it at the time.
双语例句
例：
With hindsight, we'd all do things differently.
事后想来，我们可能都会以不同的方式做事。
例：
With hindsight it can be seen as an important first stage in the controlled evolution of democracy.
事后看来，可以把它视为民主控制的演变中重要的第一阶段。
例：
In hindsight, the benefits of Internet advertising were grossly exaggerated.