you discover facts that show that it is definitely true.这句语法对么,为什么两个that,
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对!You discover facts that show (that可省略) it is definitely true.
即：You discover facts that show it is definitely true.
第一个that指代facts,引导后置定语从句.
第二个that引导show后面的宾语从句.
翻译：你们发现了真相,这个真相表明了,某件事是完全对的.