The time was in the early 70s, so factory farming was not well-known, was not as dominated as it is today, but it still existed.

那时是70年代早期，工厂化养殖并不为很多人所知,也不如今天这样占主导地位，但当时已经出现了这种方式。

普林斯顿公开课 - 人性课程节选

But here's a four-year instead of factory blocking my view, it's the miss of time blocking my view.

但这里有四年,不是被工厂挡住视线，而是有一段时间没看到。

耶鲁公开课 - 死亡课程节选