人的一切活动都有其心理动力驱动，而需要是心理动力的源泉。

Need is the source of psychological force which drives man's activities.

youdao

音乐学习心理动力的理论探讨，对普通中小学音乐教育有着积极的现实意义。

The theoretical exploration of music learning psychological motivation has an active and realistic meaning to music education in general middle and primary schools.

youdao

建构起激发青年教师心理动力的机制，既要施加外部压力，更要强化主体的内部动力。具体来说，可以进行评估强化、晋级强化、奖励强化以及自主强化。

It needs both pressure from outside and initial forces to set up the psychological mechanism of young teachers, by strengthening evaluation, promotion, rewards, and autonomy.

youdao

And the problem is the same sort of dynamic plays itself out even in the scientific debate back and forth.

问题是，心理动力在科学辩论中,也是以相同的方式在进行循环辩证。

耶鲁公开课 - 心理学导论课程节选

The two main ones involve the existence of an unconscious, unconscious motivation, and the notion of unconscious dynamics or unconscious conflict which lead to mental illnesses, dreams, slips of the tongue and so on.

这两个观点涉及了无意识动机的存在,以及导致心理疾病，梦境，口误等心理过程的,无意识动力或无意识冲突的概念。

耶鲁公开课 - 心理学导论课程节选