And I end up going back and doing unit testing anyway, to try and figure out why it doesn't work. So over the years, I've just convinced myself I might as well start where I'm going to end up.

第一次从来不会正常运行,因此无论如何我还要回头去做单元测试,找找哪儿出错了，因此经过这么多年，我已经说服自己既然一定要做单元测试,那么还是一开始就做最好了。

麻省理工公开课 - 计算机科学及编程导论课程节选

For example, this transfer RNA has a unit here, at one end of the transfer RNA molecule.

举个例子,这个tRNA的一端,有一个GAG的碱基序列单元

耶鲁公开课 - 生物医学工程探索课程节选