preference curve meaning in English

偏爱曲线

The results of the questionnaire and english scores were inputted into the computer , a statistical analysis system ( spss 10 . 0 ) was used to analyze them . the findings are summarized as follows : subjects high in nachievement prefer working on moderately difficult tasks but subjects low in nachievement show quite a different preference curve , they prefer tasks which are either the most difficult one or the easiest one
具有低成就动机的人对自己能力的估计不是过高就是过低，抱负水准往往不合实际，他们常选择特别容易或特别难的任务，因为容易的任务挑战性小，易于成功，在过难的任务上失败了可以推卸责任，降低内心的焦虑水平。