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昔， むかし
1. the old days, the past, former times, a long time ago
2. the past ten years, the past decade
从前，很久以前；过去十年，过去的十年
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
