求翻译：（2）学习动机不强，美国教育心理学家奥苏贝尔明确指出“动机与学习之间的关系是典型的相辅相成的关系，绝非一种单向性的关系”（1999）成功体验能强化学习动机，失败体验使他们学习动机减弱，甚至为了避免失败干脆放弃学习，进入到一个恶性循环。是什么意思？

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(2) motivation is not strong, United States educational psychologists Ausubel's made it clear that "is typical of the relationship between motivation and learning complementary relationship is by no means a one-way relationship" (1999) successful experiences can strengthen motivation, failed to expe

(2)The learning motivation is not strong, U.S.A. educates the psychologist Bell Su of points out " the relation between motive and study is typical relations of complementing each other " clearly, absolutely not a kind of unidirectional relation " (1999) can experience to succeed in the strong chemi