演讲者用他遇到mark的经历，来说自己的倒霉遭遇，教授本来要点名mar

The speaker met with his mark of experience, who suffered his own bad luck, the original name of the professor points mark, the results mark pretend he was no longer on the class, the professor had to point to another, and finally to the yin and yang kevin on the wrong point of difference

The speaker used his experience with mark, to talk about his own bad luck, the professor originally named mark, the result mark pretended that he was no longer in class, the professor had to point another person, and finally on the yin and yang wrong point to kevin

The lecturer used his experience of meeting mark to talk about his misfortune. The professor wanted to call Mark, but mark pretended that he was no longer in class, so the professor had to call another person, and finally he called Kevin for the difference between yin and Yang<br>