She lived up to her promises. [=she kept her promises]她实现了自己的诺言。

He has found it difficult to live up to his name/reputation. [=to be as good/successful as people think he is or should be]他发现很难不负众望。

Their vacation didn't live up to their expectations. [=their vacation wasn't as good as they expected it to be]他们的假期过得没有预期的好。