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埋头苦干 * * + +

埋 bury, secrete, conceal

头 head / top / chief, first / boss

苦 bitter / hardship, suffering

干 oppose, offend / invade / dried

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埋頭苦幹' + 埋头苦干 * * + to bury oneself in work (idiom); to be engrossed in work / to make an all-out effort up to the

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