motivity

the competition, especially the intraspecies competition, is the mechanism and motivity of biological existence and evolution.

竞争，尤其种内竞争，是生物存在和进化的机制和动力。

the technology of hydrostatic transmission has been widely applied on the driving system of construction vehicle. its performance determines the motivity, life and fuel economic use of vehicle.

液压传动与控制技术在工程车辆行驶驱动系统中应用得越来越广泛，其性能对工程车辆的动力性、经济性、可靠性影响极大。

Thus, this research is for seeking teacher's relatively steady requirement and motivity in different career stage, offering the realistic idea and feasible mechanism to realize professional development for school administrator and common teacher. The main body of this thesis is started with literature reserch.

所以，本研究就是为了通过探寻教师在不同职业生涯阶段中相对稳定的需要和动力，为学校管理者和普通教师提供在学校具体环境中实现专业发展的现实构想和可行机制。