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ご無沙汰, 御無沙汰, ご不沙汰, 御不沙汰, ごぶさた
1. not writing or contacting for a while, neglecting (failing) to write (call, visit, etc.), long silence
一段时间内不写信或不联系,疏于(未能)写信(打电话、探望等),长期沉默
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