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零下， れいか

1. below zero, sub-zero

tbd

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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

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だ

1. be, is

断定助动词，是，是也

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