But a study of elderly patients discharged from a hospital's intensive care unit (ICU) shows that almost 40 percent did not survive beyond the research period of three years.

VOA: standard.2010.03.07

There's just more sequences in a three unit codon than I need for the amino acids.

一个氨基酸对应不止一个密码子,由三碱基所构成的密码子

耶鲁公开课 - 生物医学工程探索课程节选

So the repeating unit in DNA is this structure here, a nucleotide, which has three different regions.

NA的重复单位就是,核苷酸,它有三个不同的区域

耶鲁公开课 - 生物医学工程探索课程节选