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死ぬ， しぬ
1. to die, to pass away
2. to lose spirit, to lose vigor, to look dead
3. to cease, to stop
死，死亡
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
