in a blue mood的音標是[?n ? blu? maud?d]，基本翻譯是“情緒低落，心情郁悶”。速記技巧是：blue（藍色）的諧音是“不樂”，可以理解為“不開心”。

“in a blue mood”的意思是情緒低落，這個詞來源于英語中的blue，這個詞本身來源于古英語blēo或blōu，意思是藍色或沮喪的。

變化形式：在詞形上，blue可以變為bluish，表示稍微有點兒憂郁的。

相關單詞：

1. gloom - 暗淡，憂郁

2. melancholy - 憂郁，悲傷

3. dejected - 沮喪的，失望的

4. despondent - 失望的，沮喪的

5. blue-collar - 藍領工人

6. blue-sky - 空想，幻想

7. blueprint - 藍圖，計劃

8. blue-state - 藍州，指民主黨支持率高的州

9. blue-blood - 貴族，名門望族

10. blue-chip - 高價值股票，藍籌股

這些單詞都與“blue”這個顏色或情緒有關。在英語中，“blue”這個詞經常用來形容人的情緒低落或沮喪，也可以用來描述某些事物或情況的不樂觀或令人失望。

常用短語：

1. in a bad mood

2. in a good mood

3. be in a high mood

4. be in a low mood

5. be in a great mood

6. feel blue

7. be down in the dumps

例句：

1. I am feeling in a bad mood today, I don"t know why.

2. He was in a good mood when he arrived, but soon became frustrated.

3. After a hard day"s work, I am in a low mood and need to unwind.

4. She was in a great mood all day, singing and dancing around.

5. I feel blue when I am alone at home on a rainy day.

6. He is always down in the dumps when things don"t go his way.

英文小作文：

I am feeling in a blue mood today, I don"t know why. Maybe it"s because I have been working so hard lately and haven"t had much time to relax. I feel like I am missing out on life and all the beautiful things it has to offer. However, I know that I need to take some time for myself and recharge my batteries, otherwise I will burn out and become even more unhappy. So, I am going to take a long bath, watch some movies, and try to forget about all of my troubles for a while. Hopefully, this will help me feel better and give me the energy I need to tackle the challenges that lie ahead.