苦心 kǔxīn

kǔxīn noun painstaking effort; to take a lot of trouble; laborious at pains
Domain: Literary Chinese 文言文 , Subdomain: , Concept:
Notes: (CC-CEDICT '苦心')

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苦心孤诣煞费苦心苦心经营皇天不负苦心人

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