煞費苦心

shàfèikǔxīn

cudgel one's brains; take great pains

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sha4 fei4 ku3 xin1

to take a lot of trouble (idiom); painstaking, at the cost of a lot of effort

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煞費苦心|煞费苦心 [shà fèi kǔ xīn] ► to take a lot of trouble (idiom); painstaking ► at the cost of a lot of effort