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你可能对此问题进行反驳：为什么他们不攻击我们？
You could counter that question with: Why wouldn't they attack us?
youdao
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为什么免疫系统不攻击小肠？
Why Doesn't the Immune System Attack the Small Intestine?
youdao
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为什么免疫系统不攻击小肠？
Why Doesn't the Immune System Attack the Small Intestine?
youdao