Heredity is a predisposing factor, but the exact mechanism is unclear.
遗传是患病因素之一，但确切的机制并不清楚。
The fundamental cause is unknown, though a number of predisposing conditions are recognized.
虽然研究者们已经发现了很多相关的发病因素，但其发病机制仍不清楚。
The fundamental cause is unknown, though a number of predisposing conditions are recognized.
虽然研究者们已经发现了很多相关的发病因素，但其发病机制仍不清楚。
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