范文：
Title: 21 in English: A Comprehensive Guide
Introduction:
The number 21 holds significance in various contexts, whether it's in mathematics, popular culture, or historical events. In English, the number 21 is represented in a straightforward manner. This guide will explore the correct English translation of the number 21, its pronunciation, and its usage in different scenarios.
Body:
1. Pronunciation:
The number 21 is pronounced as "twentyone" in English. The word "twenty" is pronounced as /ˈtwenti/ and "one" as /wʌn/.
2. Writing:
To write the number 21 in English, you simply combine the words "twenty" and "one" together: twentyone.
3. Usage in Numbers:
In a sequence of numbers, 21 is the twentyfirst number after 20 and the twentysecond before 22.
4. In Dates:
When referring to dates, 21 is used as part of the day of the month. For example, "21st" is the abbreviation for the 21st day of any month.
5. In Sports:
In sports, especially in the United States, the number 21 is often associated with significant achievements. For instance, the "21 and Over" rule in baseball refers to a player hitting a home run with two strikes.
6. In Pop Culture:
The number 21 has been featured in various songs, movies, and books, often symbolizing themes like aging, transition, or a pivotal moment.
7. In Numerology:
In numerology, the number 21 is associated with creativity and transformation.
8. In Mathematics:
In mathematics, the number 21 is a prime number, as it has no divisors other than 1 and itself.
9. In History:
Historically, the number 21 has been significant in various events, such as the 21st Amendment to the United States Constitution, which repealed Prohibition.
10. In Idioms:
The phrase "twentyone" is also used in idioms, such as "at the age of twentyone," which means at the age of 21 years old.
Conclusion:
The number 21, represented as "twentyone" in English, is a straightforward and essential number in various contexts. Whether in numbers, dates, sports, pop culture, numerology, mathematics, history, or idioms, the number 21 plays a significant role and is easily recognizable.
常见问答知识清单：
1. What is the English translation of the number 21?
2. How do you pronounce the number 21 in English?
3. What is the abbreviation for the 21st day of a month?
4. How is the number 21 significant in baseball?
5. Can you give an example of a song that uses the number 21?
6. What does the number 21 represent in numerology?
7. Is 21 a prime number in mathematics?
8. What historical event is the 21st Amendment related to?
9. How is the number 21 used in idioms?
10. Why is the age of 21 significant in some legal contexts?
详细解答：
1. The English translation of the number 21 is "twentyone."
2. The number 21 is pronounced as /ˈtwenti/ /wʌn/ in English.
3. The abbreviation for the 21st day of a month is "21st."
4. In baseball, the "21 and Over" rule refers to a player hitting a home run with two strikes.
5. An example of a song that uses the number 21 is "21 Guns" by Green Day.
6. In numerology, the number 21 is associated with creativity and transformation.
7. Yes, 21 is a prime number in mathematics.
8. The 21st Amendment to the United States Constitution is related to the repeal of Prohibition.
9. The number 21 is used in idioms like "at the age of twentyone," which means at the age of 21 years old.
10. The age of 21 is significant in legal contexts as it is often the age of majority, where individuals gain full legal rights and responsibilities.
