Fisher notes that not every stutterer in the Drayna study had the defective gene, meaning there must be a number of other genes tied to stuttering.

VOA: standard.2010.02.11

The ancients, he believes, operated with a defective understanding of human freedom.

他认为古人对,何为人的自由的理解是不完整的。

耶鲁公开课 - 政治哲学导论课程节选

One way is to replace a gene that's defective in a disease.

其中之一是置换,导致某种疾病的缺陷基因

耶鲁公开课 - 生物医学工程探索课程节选