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当然のことながら， 当然の事ながら， とうぜんのことながら
1. naturally, not surprisingly, it should be appreciated that, understandably, as a matter of course, as is obvious, as will be understood
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
