Only about one-billionth of the total DNA in stool samples is of human rather than bacterial origin, and most of the human DNA comes from normal gastrointestinal cells.是什么意思_Only about one-billionth of the total DNA in stool samples is of human rather than bacterial origin, and most of the human DNA comes from normal gastrointestinal cells.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句