Definition of shijie, shidi, shixiong (compared with jiejie, didi, gege, etc.) If you all go go the same school, then students of all grades are like entering a big family.You can call each other School Brothers (学长,学弟) or School Sisters (学姐,学妹) according to the order of entering school instead of age. Similarly, outside of school, if you have the same teacher, you can also ... More @Wikipedia
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