苦心孤诣

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中文拼音: ku3 xin1 gu1 yi4
中文繁体: 苦心孤詣
英文翻译: to make painstaking efforts (idiom); after much trouble/to work hard at sth

苦心ku3 xin1 苦心经营ku3 xin1 jing1 ying2