21的英文怎么写

"21"用英文写作"twenty-one"。若你需要一篇关于数字21的文章，以下是一篇简短的例子：

In the world of numbers, twenty-one holds a special place in many cultures and fields. It is often seen as a significant milestone, marking the age of adulthood in many societies. This number has been celebrated in literature, music, and popular culture for its unique properties and symbolic meanings.

Mathematically, twenty-one is an interesting number because it is the sum of the first six positive integers (1+2+3+4+5+6=21), making it a triangular number. Additionally, it is the product of three and seven, two prime numbers, which adds to its intrigue in mathematical discussions.

In the realm of games, twenty-one is best known as the goal in Blackjack, a popular casino card game. Players aim to have their hand total closer to twenty-one than the dealer’s hand without exceeding it. This simple yet strategic game has captivated players around the globe for decades.

Furthermore, twenty-one is associated with various traditions and celebrations. In some countries, turning twenty-one is a rite of passage, often marked by parties or ceremonies that celebrate the transition into adulthood. The number also appears in sports, such as American football, where the scoring system can lead to a final score of twenty-one points.

The significance of twenty-one extends beyond these examples, influencing art, science, and everyday life. Its presence in so many different contexts highlights the interconnectedness of human culture and the universal language of mathematics.

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