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なんと， 何と
1. what, how
2. what (a) ...!, how ...!
3. surprisingly, to my amazement, believe it or not, why, ...!
4. oh my, wow
5. well, ..., so, ...
如何，怎么
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
