Stewart returns as Bella and says the year since the original Twilight film has turned her character's life upside-down.

VOA: standard.2009.11.23

This is important because this molecule here, deoxyribose, is not the same upside down as it is - it's not symmetrical upside down and right side up, it's different because the 5' carbon's either pointed up or pointed down.

这很重要,因为对脱氧核糖来说,不都是像这样自上而下的,不是对称的自上向下或全部向上的,长链不同是由于,5'碳向上或者向下的指向不同

耶鲁公开课 - 生物医学工程探索课程节选

It wouldn't be the same if I turned it upside down because the carbons - the rings here, the pentose's would all be turned over, the chemistry would look different and the sequence of bases would look different.

记住单链倒过来,就和原来不一样了,这是因为碳原子和糖环结构,戊糖会翻转,使得这个化学结构看起来不一样了,碱基的顺序也不一样了

耶鲁公开课 - 生物医学工程探索课程节选

So, imagine taking two IgG's, turning one upside-down and then they're hooked together.

想象一下,有两个IgG分子,将其中一个倒置,那么两个分子将会相互钩住

耶鲁公开课 - 生物医学工程探索课程节选