天下 (tiān xià) means “land under heaven; the whole world; the whole of China; realm; rule”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
天下兴亡,匹夫有责。
Tiānxià xīngwáng, pǐfū yǒu zé.
The rise and fall of the nation is everyone's responsibility.
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