Or,he said human DNA really was present in the bone, but the bone was too small or low-quality to repeat the first results.

VOA: special.2011.03.15

We don't need to really talk about all the molecular detail in order to completely describe a DNA or an RNA molecule because these structures repeat themselves.

我们在完整的描述一个DNA或RNA时,不需要说明,分子上的每一个细节,因为它们的结构都是重复的

耶鲁公开课 - 生物医学工程探索课程节选