人机工程学就是研究与解决“人—机—环境”三者协调统一，使人机系统和谐的学科。
The man-machine engineering is a discipline which study and solve "the human - machine - environment" to make them unified and to make the man-machine system harmonious.
维护健康就是维护人的整体功能动态平衡，治疗疾病就是使失去动态平衡的整体功能恢复到协调与和谐状态。
Therefore, maintaining health actually means conserving the dynamic balance of body functions, and curing diseases means restoring chaotic body functions to a state of coordination and harmony.
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