Heatherton himself shied away from direct study of it for years, even though he had been exploring self-control, self-esteem and other related issues since graduate school.

• 多年来，黑勒顿一直不敢直接研究这个题目，尽管他从研究所毕业以来，就探讨过自我控制、自尊以及其他相关的题目。