它的确切原因不明，但它可能包括免疫反应。
Its exact causes are unknown, but it may involve immunologic reactions.
虽然确切原因不明，白癜风有时抵消了严重压力。
Although the exact cause is unknown, vitiligo is sometimes set off by severe stress.
虽然确切原因不明，白癜风有时抵消了严重压力。
Although the exact cause is unknown, vitiligo is sometimes set off by severe stress.
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