In Chinese mainland, the words junior high school and senior high school are not common, but they are often used in universities. College girls will find this word elegant and romantic, and it is often mentioned. But in fact, seniors are from Japanese vocabulary. It was quoted by China, Taiwan Province Province and South Korea, and was introduced to the mainland through Taiwanese and Korean dramas. The original intention is that both seniors and older women should use the word "senior" to show respect for seniors, not just senior men, that is, "learning elder brother".
Senior, a person who presides over learning things. Wu Zeng's Notes on Gai Zhai (Volume XIII): "Zhang Jian is right and Zhang Wei is vice." (Ci Hai, Shanghai Dictionary Publishing House)
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