苦 ㄎㄨ ˇ kǔ 心 ㄒㄧㄣ xīn 孤 ㄍㄨ gū 诣 ㄧ ˋ yì 苦 ㄎㄨ ˇ kǔ 心 ㄒㄧㄣ xīn 孤 ㄍㄨ gū 詣 ㄧ ˋ yì to make painstaking efforts (idiom); after much trouble to work hard at sth