fortieth的音標是[?f??rt??θ]，基本翻譯是第四十，速記技巧可以是注意中間的“o”和“w”的區別。

Fortieth這個詞的詞源可以追溯到拉丁語詞forti，意為“勇敢的”或“強大的”。它經過了幾個變化形式，包括forti-（前綴，表示“加強”）和-th。這個詞在英語中常見于表示順序的數字前，如first、second、third等，直到fortieth。

以下是與fortieth相關的單詞及其變化形式和解釋：

1. forty：這個詞直接來自于fortieth，意為“四十一到一百之間的所有數字”。它是一個合成詞，由前綴“for”和“ty”組成，表示“四十”的意思。

2. fortitude：這個詞由forti-和-itude組成，意為“堅韌不拔的品質或行為”。它通常用來形容在困難或痛苦中堅持下去的能力。

3. fortify：這個詞由forti-和-fy組成，意為“加強”或“增強”。它通常用來指通過提供支持或資源來加強某人的能力或信心。

4. fortuitous：這個詞由fort-和-uous組成，意為“偶然的”或“意外的”。它通常用來形容那些沒有預料到或計劃好的事件或情況。

5. fortress：這個詞由forti-和-ress組成，意為“堡壘”或“要塞”。它通常用來指一個強大的防御工事或地方。

6. fortunate：這個詞由fortune-和-tious組成，意為“幸運的”或“有利的”。它通常用來形容那些得到好運或機會的人或事物。

7. fortunate (adj.)：幸運的；幸運的(形容詞形式)。這個詞可以用來形容一個人或事物得到了好運或成功。

8. fortieth (num.)：第四十(數詞形式)。這個詞可以用來表示第四十個或類似數量的概念。

9. fortunate (n.)：幸運者；幸運的人(名詞形式)。這個詞可以用來形容一個被認為很幸運的人。

10. fortunate (adj.) in：在…方面很幸運(形容詞短語形式)。這個詞可以用來形容某人在某個方面很幸運。

以上就是與fortieth相關的十個單詞及其變化形式和解釋，這些單詞在英語中有著廣泛的應用和影響。

常用短語：

1. fortieth floor

2. fortieth of June

3. fortieth birthday

4. fortieth anniversary

5. fortieth of July

6. fortieth of May

7. fortieth of September

雙語例句：

1. On the fortieth floor, there is a panoramic view of the city. (在四十樓，可以看到城市的全景。)

2. We celebrated our fortieth wedding anniversary last month. (上個月我們慶祝了我們的結婚四十周年紀念。)

3. It was my fortieth attempt before I finally succeeded. (我嘗試了四十次才終于成功。)

4. We are celebrating our fortieth anniversary next week. (下周我們將慶祝我們的四十周年紀念。)

5. It was my fortieth birthday and I was feeling very happy and contented with my life. (我的四十歲生日到了，我對我的生活感到非常開心和滿足。)

6. The fortieth of July is a national holiday in many countries. (七月四日是許多國家的國慶節。)

7. The fortieth of September is the day when we celebrate our Independence Day in India. (九月四日是我們慶祝印度獨立日的日子。)

英文小作文：

Today is my fortieth birthday, and I feel very lucky to have reached this milestone in my life. Looking back, I realize that I have been through a lot of ups and downs, but I am grateful for every experience because it has made me who I am today.

I remember my first job, when I was just starting out in the workforce, and how nervous and unsure I was at the beginning. But with time, I gained experience and confidence, and now I am proud of what I have achieved in my career.

My family and friends have also been a big support to me throughout my life. They have been there for me when I needed them the most, and I am grateful for their unwavering love and support.

Today, I am not just celebrating my own personal milestone, but also the journey of life itself. I am looking forward to the future with hope and optimism, knowing that every day is a new opportunity to learn, grow, and make a difference in the world.