Need is the source of psychological force which drives man's activities.
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。
Some children are not willing to go to school is a source of psychological problems.
有些孩子不肯上学是源于心理问题。
Some children are not willing to go to school is a source of psychological problems.
有些孩子不肯上学是源于心理问题。
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