And many of these operating and abnormal operating procedures, and certainly emergency procedures, are symptombased.
很多的运行和不正常的运行步骤，还有当然，紧急的步骤，就是基本的征兆。
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Homeopathy is based upon the "law of similars". The idea is an ingredient that causes a certain symptom can help trigger the body to "fight" that symptom.
It is difficult to diagnose some faults of satellites using the knowledge of only one symptom field. Based on Evidence Reasoning Theory, this paper introduces a new method to diagnose the faults.