苦心孤诣

苦心孤诣 [kǔ xīn gū yì]

1. ■ try hard to (do); make [have; register] a notable achievement after extraordinarily persistent and painstaking efforts; make extraordinarily painstaking efforts; notable achievement after persistent work; toil single-heartedly; with patience and enduring resolve; work with a bitter heart and make progress single-handed:

为了改造环境， 他苦心孤诣地制订了这个计划。 In order to transform their environment, he drew up the project with painstaking accuracy.