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兄さん, にいさん, あにさん
1. older brother, elder brother
2. brother (as older-brother figure in friendly and or work relationship)
3. young man, buddy, fella, laddie
tbd
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题;表示与另一选项(无论是否明确提及)形成对比;表示强调