简言之，no more 指“数量或程度上不再增加”；no longer 指“时间上不再延长”。比较：

I will eat no more. （并非强调动作不再发生，难道从今往后“不再吃饭了吗”？）

I will wait no onger.

(1)no more=not any more 强调动作不再发生

I will say no more on these matters, important though they are.  

虽然这些事很重要，我也不想再说什么了。

He could stand no more and engineered an escape.  

他无法再忍受，便策划了出逃。

You won’t ever see her any more. 

你不会再见到她。

We won’t have any more discussion about it. 

我们将不再作更多讨论了。

(2)no longer=not any longer强调时间不再延续。

We are no longer children now.

我们现在不再是孩子了。

He knows that he is no longer young. 

他知道自己不再年轻。

I no longer have any objection to your going to see her.  

我不会再因为你去见她而不高兴。

She was devoted to him, but she no longer loved him madly.  

她一心一意地爱他，但是这份爱不再疯狂。

The construction industry is no longer as depressed as it was.  

建筑业不再像以往那样萧条了。