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The National Autistic Society said the exact causes of autism were unknown.
英国全国孤独症协会指出，孤独症的确切成因仍然未知。
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Its exact causes are unknown, but it may involve immunologic reactions.
它的确切原因不明，但它可能包括免疫反应。
youdao
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Its exact causes are unknown, but it may involve immunologic reactions.
它的确切原因不明，但它可能包括免疫反应。
youdao