于
설명
“于”作为介词，常用于书面语中，引出动作发生的时间、处所或范围，相当于“在”。
The preposition '于' is often used in formal language to introduce the time, location, or scope of an action, equivalent to 'in' or 'at'.
예문
他出生于1995年。
He was born in 1995.
大熊猫主要生活于中国西南地区。
Giant pandas mainly live in the southwestern region of China.