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In Chinese, the character "于" is a preposition that is commonly used to indicate time and place. It serves to introduce specific temporal or locational information in a sentence.
Indicating Time: When used to express time, "于" is often followed by a specific date or year. For example, in the sentence "他出生于1995年" (He was born in 1995), "于" introduces the year of birth, providing a clear temporal reference.
Indicating Place: "于" can also denote a location where an action occurs or where something exists. For instance, in the sentence "大熊猫主要生活于中国西南地区" (Giant pandas mainly live in the southwestern region of China), "于" introduces the place where giant pandas are primarily found.
Overall, "于" is a versatile preposition that helps to clarify the time and place in which events take place, making it an essential component of Chinese sentence structure.