One problem is that they're not always accurate and there's a couple of factors that could lead them away from accuracy.

其中一个问题就是它们并不总是准确的,有几个因素,能减低它们的准确性。

耶鲁公开课 - 心理学导论课程节选

The flip side is there are going to be a couple of lectures now where it is not going to be on the test, so I think you will deal with it.

现在这种对立面将是,一些现在的课程,这些不会在考试上出现，所以我想你能处理好的。

麻省理工公开课 - 固态化学导论课程节选

There's historical scholarship that used to argue that a couple of generations ago, but not anymore.

几代以前有些历史学者曾经持这种观点,但现在没有了

耶鲁公开课 - 美国内战与重建课程节选