UNDERSTAND 明白, to know and understand something, or suddenly begin to understand it

知道; 明白; 认识到; 顿悟:

I suddenly realized that the boy was crying.

我突然意识到那男孩在哭。

Do you realize you're an hour late?

你知道你迟到了一小时吗？

I'm sorry, I didn't realize who you were.

对不起，我没认出你是谁。

It took us a while to realize the extent of the tragedy.

我们过了一段时间才意识到这场惨剧的程度。

It was only later that I realized my mistake.

我到后来才认识到我的错误。

ACHIEVE 实现, [formal] to achieve something that you were hoping to achieve

实现，将…变为现实:

She never realized her ambition of winning an Olympic gold medal.

她一直都没有实现赢取奥运会金牌的抱负。

a young singer who has not yet realized her full potential (=achieved as much as she can achieve)

一个尚未充分发挥潜力的年轻歌手

sb's worst fears were realized used, to say that the thing that you were most afraid of has actually happened

某人最担心的事情发生了:

His worst fears were realized when he heard that Chris had been arrested.

当他听说克里斯被逮捕了，他最害怕的事情终于发生了。

MONEY 金钱