Now we know that Milton was blind probably well before the time he began writing Paradise Lost, and therefore, of course, he was then unable to read.

现在我们知道弥尔顿很可能失明了,这早于他开始写《失乐园》的时间，因此，他不能通过眼睛阅读。

耶鲁公开课 - 弥尔顿课程节选

Some of those kids will need coronary bypass surgery in their twenties; some of them will be blind by the time they're thirty.

这些孩子有的要在二十多岁时,做冠状动脉搭桥手术,有些人在三十岁的时候会失明

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选