长江天堑 (長江天塹) chángjiāng tiān qiàn

chángjiāng tiān qiàn set phrase the Yangtze River as a natural boundary
Domain: Literary Chinese 文言文
Notes: (Guoyu '長江天塹'; Mathews 1931 '長江天塹', p. 23)

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Truncated for common words