WHO recommends a systematic approach to vector control-based on evidence and knowledge of the local situation.
世卫组织建议，以证据和对地方情况的了解为依据，系统地实施媒介控制。
Based on that, modeling and control of knowledge flows are studied.
在此基础上，对知识流的建模与控制进行了深入的研究。
Based on construction and function of the fire control system, a new object-framework knowledge representation method is introduced.
从诊断对象的结构和功能原理出发，提出了一种对象式框架知识表示方法。
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