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。
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