Cooperative or joint action which achieves an end which independent action could not achieve.

协力合作。

Interaction of discrete agencies (as of industrial firms or physical equipment) in combination such that the total effect is greater than the sum of the individual effects.

增效作用(分立的机构如工商企业或物质设备等在联合时所起相互作用的总效果大于独立作用效果的总和)。