苦心kǔxīn 1.辛苦地用在某些事情上的心思或精力{trouble taken; painstaking efforts}: 煞费～{take a lot of trouble}|一片～。{trouble and pain taken for a good cause} 2.费尽心思{extend much care and thought}: ～研究{study assiduously}|～经营。{take great pains to build up (an enterprise, etc.)}