杞国 (杞國) qǐguó

qǐguó noun the State of Qǐ
Domain: History 历史 , Subdomain: China , Concept:
Notes: c. 1500-445 BCE; in modern Qǐ county 杞县, Henan, a small vassal state of Shang and Western Zhou for most of its existence (CC-CEDICT '杞國')

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杞国之忧杞国忧天