eightieth

eightieth的音标是[ˈeɪtiəθ]，基本意思是“第八十的，第八十个的”，可以速记为“eigh-tenth”。

Eightieth的词源：

Eightieth这个词是由英语单词Eight和Century合并而成的，其中Eight表示“八”，Century表示“世纪”。因此，Eightieth表示“第八十的”，即一个世纪中的第八十个年份或事件。

变化形式：

Eightieth是数词之一，没有变化形式。

相关单词：

1. Eighteenth：表示“第十八的”，是Eightieth的前一个数字形式。

2. Hundredth：表示“第一百的”，是数词之一，与Eightieth有相似的含义。

3. Thousandth：表示“第一千的”，也是数词之一，与Eightieth有相似的含义。

4. Eighty-first：表示“第八十一的”，是Eightieth的后一个数字形式。

5. Eighty-fifth：表示“第八十五的”，是Eightieth加上第五个数字的形式。

6. Eighty-seventh：表示“第八十七的”，是Eightieth加上第七个数字的形式。

7. Eighty-eighth：表示“第八十八的”，是Eightieth加上第八个数字的形式。

8. Eighty-ninth：表示“第八十九的”，是Eightieth加上第九个数字的形式。

9. Eighty-second：这是一个复合数词，由Eighty和Second组成，表示“第八十二的”。

10. Eighty-third：这是一个复合数词，由Eighty和Third组成，表示“第八十三的”。

例句：The company has reached its eightieth birthday, and it has achieved a lot in its lifetime.（公司已经迎来了它的八十岁生日，它的一生取得了很大的成就。）

常用短语：

1. the eighth of July

2. the eighteenth century

3. eightieth birthday

4. eightieth parallel

5. eightieth state

6. eightieth day

7. eightieth time

例句：

1. My birthday is on the eighth of July.

2. The eighteenth century was a time of great change and invention.

3. Today is my father"s eightieth birthday.

4. The eightieth parallel crosses the northern part of Russia.

5. The eightieth state joined the United Nations.

6. After eighty days of hard work, we finally finished the project.

7. I have been trying to learn English for the eightieth time, but still I find it difficult.

英文小作文：

Today, I am celebrating my eightieth birthday, and I am feeling very lucky to have lived through so many changes in my lifetime. From the invention of the telephone and the television to the internet and social media, technology has made life easier and more convenient for us all. However, I also remember the hardships of my childhood and the challenges of building a career and raising a family, and I am grateful for all the support and love I have received from my family and friends throughout my life. I hope that I can continue to live a long and healthy life, and I hope that my experiences can inspire others to pursue their dreams and goals with courage and persistence.