blue 蓝色的，悲伤的，忧郁的，下流的
 
实用短语：
Blue in the face 面红耳赤
例句：
He argued with the boss until he was blue in the face.
他与老板争论得面红耳赤
 
实用短语：
Once in a blue moon 极为罕见
例句：
It is once in a blue moon to see her do housework.
看见她做家务真是极为罕见啊。
 
实用短语：
Out of the blue 出乎意料，突然，晴天霹雳
例句：
His death was out of the blue to his family.
他的去世对他的家人来说是晴天霹雳。
He looks blue today. I wish we could make him happier.
他今天情绪低落，我希望我们能够使他快乐一些。
 
日常英语对话
 
Mike：They’re all blue in the face. What’s the matter?
迈克：他们面红耳赤的，发生什么事了？
Jack：The woman suspected the man stolen her purse.
杰克：那个女的怀疑那个男的偷了她的钱包。
Mike：Does she have any evidence?
迈克：她有什么证据吗？
Jack：She said she found the wallet in his bag, and many people could give some witness.
她说她在他的包里发现了钱包，并且很多人都可以作证。
 
重点英语词汇
 
What’s the matter=what’s up
怎么了，发生什么事了？
Suspect [səˈspekt] 怀疑，疑有
Witness [ˈwɪtnəs] 证据，证明，目击者