If the vices of the paper significantly outweigh the virtues, D that's a D.

如果论文的缺点明显比优点多，那就是。

耶鲁公开课 - 死亡课程节选

If the vices very significantly outweigh whatever virtues there are, that's some kind of an F.

如果论文的缺点非常一定及肯定比优点多，那大概就是F了。

耶鲁公开课 - 死亡课程节选