需要是人对客观事物的要求在脑中的反映。机体为了生存和发展，必须与客观事物保持积极的平衡，这种平衡被破坏引起紧张的状态，反映到脑中就产生需要的主观体验。需要可以是对需要对象的缺乏或丧失——一剥夺的体验，也可以是对需要对象的期望的体验。需要可转化为欲望或欲求 Needs is a reflection of the human demands for objective things in the mind. In order to survive and develop, the body must maintain a positive balance with the objective things. This balance is destroyed to cause tension and reflect into the brain to produce the necessary subjective experience. Need can be a lack of or loss of the desired object-a deprived experience, or an experience of the expectation of an object in need. Needs to be transformed into desire or desire