牙周炎是一类以牙槽骨吸收为主要特征的感染性疾病，但其病因理论中的许多具体机制尚未明了。
Periodontitis is an infectious diseases and the key feature is bone resorption, but the exact mechanism of etiology is unclear.
系统性红斑狼疮(SLE)是一种多因素疾病，其病因和发病机制尚未明确。
Systemic lupus erythematosus (SLE) is a multifactorial disease and its pathogenesis and precise mechanism remain unknown.
其确切的病因和发病机制目前尚未明确。
由于该病的病因病机尚未明了，故目前尚缺乏对其有效的防治措施。
As the pathogenic factor and etiopathogenesis of the disease is unclear up till now, there are not effective measures for prevention and treatment.
胃肠功能性疾病是临床上常见的消化道疾病，其病理生理复杂，病因及发病机理尚未明确，还没有一个确切有效的治疗方案。
Functional gastrointestinal disease is one of the most common disorders seen in clinical practice with rather complicated pathophysiologic mechanisms and unclear etiopathogenesis.
膝关节骨性关节炎是一种常见的以膝关节软骨损害为主，病变累及软骨下骨、滑膜和关节周围组织为特征的一种慢性膝关节疾病，其病因病理仍未明确。
Osteoarthritis(OA) is a very common disease which always destroys articular cartilage and damages bone beneath cartilage, synovium and tissues around joint . It's pathogenesis has been uncertain .
膝关节骨性关节炎是一种常见的以膝关节软骨损害为主，病变累及软骨下骨、滑膜和关节周围组织为特征的一种慢性膝关节疾病，其病因病理仍未明确。
Osteoarthritis(OA) is a very common disease which always destroys articular cartilage and damages bone beneath cartilage, synovium and tissues around joint . It's pathogenesis has been uncertain .
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