I am not happy, this is an established fact.
我不开心，这个是既定的事实。
That link is an established medical fact.
那种联系是被证实了的医学事实。
Evolution is as firmly established a scientific fact as the roundness of the Earth.
进化是既成的科学事实，和地球是圆的一样稳固。
Evolution is as firmly established a scientific fact as the roundness of the Earth.
进化是既成的科学事实，和地球是圆的一样稳固。
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