Hamiltonian of magnons system was simplified by the second quantization method presented by Holstein and Primakoff. The nonlinear interaction term of Hanitltonian was dealt with by mean theory.

采用霍尔斯坦和普里马科夫提出的二次量子化方法把磁振子系统的哈密顿量简化，并应用平均场理论处理了哈密顿量中的非线性相互作用项；

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But they also contribute through this interaction term.

但是二者的合作同样起到了作用

耶鲁公开课 - 博弈论课程节选

How do we think of that interaction term?

我们怎么考虑合作这个问题呢

耶鲁公开课 - 博弈论课程节选

Foreign firms should establish long-term interaction with leading Chinese faculty at Chinese universities, from top-rated Beijing University to Tsinghua to Fudan (in Shanghai) to other colleges in Tianjin, Dalian, Nanjing, Wuhan, Xiamen and Guangdong.

FORBES: China Turns Its Focus To Africa

Human-machine interaction -- the term sounds so clinical, yet it's the most important relationship we need to foster in the 21st century.

ENGADGET

The undertaken study and analytical report as its result are designed to describe the state of arts education in Ukraine and more vividly define the ways of its improvement over the longer term based on interdepartmental interaction of all governmental and civic institutions concerned for the sake of further fruitful development of national culture.

UNESCO: OFFICE IN MOSCOW