But when you go to restaurants or people buy steaks you just don't see anything that small, and so the serving sizes are multiples of what might be typical.

但当人们去餐馆或者买牛排的时候,不会看见这么小的肉,所以我们生活中的份量是正常大小的几倍

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Several things happen during mitosis, first, when a cell enters the process of mitosis it already has twice the DNA that it needs.

有丝分裂中有几个重要的步骤,首先,当细胞进入有丝分裂过程,细胞中已含有两倍于其正常所需的DNA

耶鲁公开课 - 生物医学工程探索课程节选