fallen down的音標是[?f?:l?n da?n]，基本翻譯是“倒下；落下；跌倒；垮下”，速記技巧是：fall（落下）+ down（向下）→落下。

fallen down的英文詞源為拉丁語fallitus，意為“倒下的，跌倒的”。其變化形式為fallen，可以作為形容詞和動詞使用。

相關單詞：

1. fall：意為“落下，跌倒”，其詞源同fallen相同，表示物體從高處落下或人摔倒。

2. decline：意為“下降，衰退”，其詞源和fall有關，表示逐漸下降或衰落。

3. collapse：意為“倒塌，崩潰”，其詞源同fall有關，表示突然倒下或崩潰。

4. fallacy：意為“謬誤，錯誤”，其詞源同fall有關，表示跌倒或摔倒后產生的錯誤或偏見。

5. fallout：意為“后果，影響”，其詞源同fall有關，表示從高處落下或摔倒后產生的后果或影響。

6. descent：意為“下降，下落”，其詞源和fall有關，表示從高處向下移動或降落。

7. drop：意為“落下，掉落”，其詞源和fall有關，表示物體從高處落下或液體從容器中流出。

8. tumble：意為“滾翻，跌倒”，其詞源和fall有關，表示物體從高處跌落或滾動。

9. plunge：意為“跳水，猛沖”，其詞源和fall有關，表示突然跌落或猛烈下降。

10. descent into poverty：意為“陷入貧困”，其詞組中包含了“descent”這個單詞，表示由于某種原因而從富裕狀態跌落到貧困狀態。

常用短語：

1. fall down in tears

2. fall down on one"s face

3. fall flat

4. fall off

5. fall behind

6. fall into pieces

7. fall into disrepute

例句：

1. She fell down in tears when she failed the exam.

2. He fell flat when he tried to persuade her to stay.

3. The ladder fell off when he was climbing up.

4. I fell behind in my studies and couldn"t catch up.

5. His nerves fell into pieces when he heard the bad news.

6. His reputation has fallen into disrepute after the scandal.

英文小作文：

標題：The Fallen Tree

Once there was a tall and beautiful tree in the forest. It was the pride of all the animals and birds in the area. However, one day, a strong wind blew through the forest and the tree fell down. The animals and birds were saddened by its loss, but they knew that they had to move on and find a new home for themselves. The fallen tree became a symbol of resilience and perseverance for all who saw it. It taught them that life is full of ups and downs, but it is always worth fighting for what is important to us.