fail的音標是[fe?l]，基本翻譯是失敗、不及格，速記技巧是諧音記憶：費了（fei le）力氣（il）就失敗了（fail）。

英文單詞“fail”的詞源是拉丁語“faillire”，意為“to fail to do”，即“失敗，不及格”的意思。其變化形式包括“failing”（失敗，缺點），“failed”（失敗的，不及格的），“failure”（失敗，失敗者）等。

相關單詞：

1. “success”（成功）：詞源同fail，意為“成功”或“達到目的”，其變化形式包括“successfully”（成功地），“successor”（接班人）等。

2. “fail”（失敗）：與fail意義相反，“win”（獲勝）意為“贏得勝利”，其變化形式包括“winner”（獲勝者），“victory”（勝利）等。

3. “attempt”（嘗試）：意為“試圖，嘗試做某事”，其變化形式包括“attempted”（嘗試的），“attempting”（試圖的）等。

fail作為動詞時，除了表示失敗外，還可以表示“忘記，未記住”的意思。例如，“I failed to remember his name”表示我忘記了他的名字。此外，fail還可以表示“不能滿足需求，不充分”的意思，例如，“The food failed to satisfy our hunger”表示食物不能滿足我們的食欲。

以上內容僅供參考，建議查閱相關書籍或咨詢專業人士以獲取更準確的信息。

常用短語：

1. fail to do sth. 未能做某事

2. fail in/out of sth. 考試不及格

3. fail to achieve one"s goal 沒有達成目標

4. fail to meet expectations 沒有達到期望

5. fail to understand 理解失敗

6. fail to keep one"s promise 沒有履行諾言

7. fail to succeed 未能成功

雙語例句：

1. I failed to pass the exam, but I will try again next time.

我考試不及格，但我會下次再試。

2. He failed to meet his boss"s expectations and was fired.

他沒有達到老板的期望而被解雇了。

3. She failed to understand the complex problem and asked for help.

她沒有理解這個復雜的問題，請求幫助。

4. He failed to keep his promise to help his friend with their project.

他沒有履行承諾幫助朋友完成項目的約定。

5. After several failed attempts, he finally succeeded in his project.

經過幾次失敗嘗試后，他終于成功完成了項目。

6. We all failed to understand the teacher"s instructions and had to ask for clarification.

我們都沒能理解老師的指示，不得不請求澄清。

7. Failure is the mother of success, and I believe that if we keep trying, we will eventually succeed.

失敗是成功之母，我相信只要我們不斷嘗試，最終會取得成功。

英文小作文：

Failure is a part of life, and it can be a challenging experience. However, failure can also be a valuable lesson that teaches us valuable lessons about perseverance and resilience. When we fail, we learn how to bounce back and try again, which can lead to success in the long run.

In my opinion, failure is not something to be afraid of, but rather something to be embraced and used as motivation to improve ourselves and our abilities. We should not give up easily, but rather use failure as a stepping stone to success. By learning from our failures and applying what we have learned, we can become stronger and more resilient individuals who are ready to face any challenge that comes our way.