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| 勞心苦思 | láoxīnkǔsī |
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| 搜索枯腸 | sōusuǒkūcháng | to rack one's brains (for apt wording etc) (idiom) |
| 絞盡腦汁 | jiǎojìnnǎozhī | to rack one's brains |
| 絞腦汁 | jiǎonǎozhī | to rack one's brains |
| 冥思苦想 | míngsīkǔxiǎng |
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