教育活动系统是一个特殊的复杂系统，具有非线性、不可还原性、自组织性、偶然性等特征。
The system of educational activities is a special complex system, it has the characteristics of nonlinear, irreducibility, self organization, contingency etc.
居民参加体育活动以自发形式为主，整体上缺乏组织性和指导性。
The major way of participating in sport were free combination and personal exercise, lacking of organization and stability.
课堂教学活动是一个特殊的复杂系统，具有非线性、不可还原性、自组织性、偶然性和开放性等特征。
The system of teaching activities is a special complex system; it has the characteristics of non-linear, irreducibility, self-organization, contingency, openness etc.
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