conscientious
/ˌkɔnʃɪˈenʃəs; ˌkɑnʃɪ`ɛnʃəs/ adj
1 (of people or conduct) careful to do what one ought to do, and do it as well as one can （指人或行为）认真的, 尽责的
a conscientious worker, pupil, attitude 勤勤恳恳的工作人员、 学生、 态度.
2 (of actions) done with great care and attention （指行动）小心谨慎的
This essay is a most conscientious piece of work. 这篇论文是精雕细刻的工作.