冬至，也被称为Winter Solstice，是每年的12月21日或22日，太阳到达黄经270°时。这一天是北半球全年中白天最短、夜晚最长的一天，标志着冬季的正式开始。
在英语中，可以这样介绍冬至：
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Winter Solstice, also known as the December Solstice, falls on December 21st or 22nd each year, when the sun reaches the celestial longitude of 270°. It is the day with the shortest daylight and longest night of the year in the Northern Hemisphere, marking the official start of winter.
The Winter Solstice is an ancient festival celebrated by many cultures around the world. It's a time of reflection and the anticipation of the return of longer days. In the Northern Hemisphere, it's traditionally a time to gather with family and friends, exchange gifts, and celebrate the rebirth of the sun.
In many places, there are various customs and traditions associated with the Winter Solstice. For example, in Scandinavian countries, people gather to jump over bonfires, a symbol of驱赶冬天（banishing winter）。In China, the day is also celebrated with special foods and activities, as it is closely linked to the Chinese lunar calendar and is often considered the beginning of the winter season.
The Winter Solstice is a reminder of the changing seasons and the cyclical nature of life, offering a moment to appreciate the darkness and prepare for the gradual return of light and warmth.
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这样的介绍可以较为全面地展示冬至的重要性和相关文化习俗。
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