fifty的音標是[?fifti]，基本翻譯是五十。速記技巧可以是諧音記憶：費福特（fifty）后面是五十（five）。

Fifty的英文詞源：

Fifty這個詞源于古英語詞匯“fift”，意為“五”。

變化形式：Fifth的詞性變化形式包括名詞fifth（第五個部分或元素）和形容詞fifth（第五個或五分之一的）。

相關單詞：

1. Fifteen（十五）：這個詞是由單詞“fifth”加上數字后綴“teen”構成的，表示“五加一”。

2. Forty（四十）：這個詞也是由“fifth”加上數字后綴構成的，表示“五加三”。

3. Fiftieth（第五十）：這個詞是由“fifth”和“-th”構成的名詞形式，表示“第五十個”。

4. Half（一半）：這個詞表示“五分之一”，與Fifth的詞義有相似之處。

5. Quindecillion（一千五百億）：這個詞是由單詞“quintillion”加上數字后綴構成的，表示“五的十次方”，是一個非常大的數字單位。

相關單詞的解釋中，我們可以了解到Fifth作為基數詞時，可以與其他數字后綴構成不同的數詞形式，同時也可以作為序數詞，表示順序的第五。此外，Fifth還經常出現在一些大數的表示中，如Quindecillion就是由五個Fifth組成的非常大的數字單位。這些單詞在英語中具有廣泛的應用，可以幫助我們更好地理解和使用Fifth這個詞源。

常用短語：

1. fifty times

2. fifty percent

3. fifty-fifty

4. on the fiftyth anniversary

5. fifty years later

6. fifty-one years old

7. fifty cents short

雙語例句：

1. This book is fifty times more readable than the previous one. (這句話可以翻譯為：這本書比上一本容易讀多了。)

2. She is fifty percent sure of her answer. (這句話可以翻譯為：她對答案有百分之五十的把握。)

3. After fifty years, we are still together and still in love. (這句話可以翻譯為：五十年過去了，我們仍然在一起，仍然相愛。)

4. He is fifty years old and still working hard. (這句話可以翻譯為：他五十歲了，仍然努力工作。)

5. She is fifty-one years old and still going strong. (這句話可以翻譯為：她五十一歲了，仍然精力充沛。)

6. I am fifty cents short of the money I need for the bus ticket. (這句話可以翻譯為：我需要買公交車票的錢差了五十分。)

7. The project is fifty percent complete. (這句話可以翻譯為：這個項目完成了百分之五十。)

英文小作文：

Fifty years ago, I was a young girl full of dreams and hope. I remember that time clearly, because it marked the beginning of my journey in life. Looking back, I realize that time flies and I have come a long way since then.

Now, I am a middle-aged woman with a family of my own. I am still working hard, but I also enjoy the fruits of my labor. I am grateful for every moment of my life, because it has taught me so much. I have learned to appreciate the little things in life, to cherish the moments with my loved ones, and to never give up on my dreams.

As I look ahead, I am filled with hope and anticipation for what the future holds. Although I am not young anymore, I know that life is full of surprises and opportunities waiting to be seized. I will continue to work hard and to seize every opportunity that comes my way, because I believe that with hard work and perseverance, anything is possible.